10. Isn't Jesus seated on God's right hand?

Yes!

Hebrews 12:2 Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.

Acts 7:55-56
But he, being full of the Holy Ghost, looked up stedfastly into heaven, and saw the glory of God, and Jesus standing on the right hand of God,
And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God.

1 Peter 3:22 Who is gone into heaven, and is on the right hand of God; angels and authorities and powers being made subject unto him.

Hebrews 1:3 Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;

Hebrews 8:1 Now of the things which we have spoken this is the sum: We have such an high priest, who is set on the right hand of the throne of the Majesty in the heavens;

What does “Jesus is set down at the right hand of the throne of God” mean?
Right hand can mean on the right side of someone or something, and it is used that way in the bible sometimes.
But in this case you will see by the following statements and scriptures that it is terminology that means the power and authority:

Matthew 26:64 Jesus saith unto him, Thou hast said: nevertheless I say unto you, Hereafter shall ye see the Son of man sitting on the right hand of power, and coming in the clouds of heaven.

Isaiah 62:8 The LORD hath sworn by his right hand, and by the arm of his strength, Surely I will no more give thy corn to be meat for thine enemies; and the sons of the stranger shall not drink thy wine, for the which thou hast laboured:

Isaiah 48:13 Mine hand also hath laid the foundation of the earth, and my right hand hath spanned the heavens: when I call unto them, they stand up together.

Psalm 118:15-16
The voice of rejoicing and salvation is in the tabernacles of the righteous: the right hand of the LORD doeth valiantly.
The right hand of the LORD is exalted: the right hand of the LORD doeth valiantly.

Psalm 20:6 Now know I that the LORD saveth his anointed; he will hear him from his holy heaven with the saving strength of his right hand.

Psalm 77:10 And I said, This is my infirmity: but I will remember the years of the right hand of the most High.

Psalm 17:7 Shew thy marvellous lovingkindness, O thou that savest by thy right hand them which put their trust in thee from those that rise up against them.

Exodus 15:6 Thy right hand, O LORD, is become glorious in power: thy right hand, O LORD, hath dashed in pieces the enemy.

Psalm 98:1 O sing unto the LORD a new song; for he hath done marvellous things: his right hand, and his holy arm, hath gotten him the victory.

Psalm 16:11 Thou wilt shew me the path of life: in thy presence is fulness of joy; at thy right hand there are pleasures for evermore.

Psalm 48:10 According to thy name, O God, so is thy praise unto the ends of the earth: thy right hand is full of righteousness.

Psalm 89:13 Thou hast a mighty arm: strong is thy hand, and high is thy right hand.

Habakkuk 2:16 Thou art filled with shame for glory: drink thou also, and let thy foreskin be uncovered: the cup of the LORD'S right hand shall be turned unto thee, and shameful spewing shall be on thy glory.

What “Jesus is set down at the right hand of the throne of God” does not mean!

It does not mean that there are two thrones in heaven(or three) and Jesus is sitting in a throne beside the Father.

Remember: John only saw one throne with only one on it!
Remember: God is invisible! Jesus has declared him! When we see Jesus in that day, we see God!
And besides, God is everywhere. Where would his right side be?

Jeremiah 23:24 Can any hide himself in secret places that I shall not see him? saith the LORD. Do not I fill heaven and earth? saith the LORD.

1 Kings 8:27 But will God indeed dwell on the earth? behold, the heaven and heaven of heavens cannot contain thee; how much less this house that I have builded?

Isaiah 66:1-2
Thus saith the LORD, The heaven is my throne, and the earth is my footstool: where is the house that ye build unto me? and where is the place of my rest?
For all those things hath mine hand made, and all those things have been, saith the LORD: but to this man will I look, even to him that is poor and of a contrite spirit, and trembleth at my word.

When John saw the Almighty, who was speaking to him, he saw one like to the Son of man!
Revelation 1:8-18
I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty.
I John, who also am your brother, and companion in tribulation, and in the kingdom and patience of Jesus Christ, was in the isle that is called Patmos, for the word of God, and for the testimony of Jesus Christ.
I was in the Spirit on the Lord's day, and heard behind me a great voice, as of a trumpet,
Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.
And I turned to see the voice that spake with me. And being turned, I saw seven golden candlesticks;
And in the midst of the seven candlesticks one like unto the Son of man, clothed with a garment down to the foot, and girt about the paps with a golden girdle.
His head and his hairs were white like wool, as white as snow; and his eyes were as a flame of fire;
And his feet like unto fine brass, as if they burned in a furnace; and his voice as the sound of many waters.
And he had in his right hand seven stars: and out of his mouth went a sharp twoedged sword: and his countenance was as the sun shineth in his strength.
And when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me, Fear not; I am the first and the last:
I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.