As that infamous dispensationalist says:you must rightly divide the Word of Truth.
I see no mention of an earthly Messianic kingdom! I see mention in verse 33 above of an eternal kingdom, not 1000 years.
Which throne is Jesus Christ sitting on: The throne of His Glory or the throne of David?
Well let's see the Throne of His glory has yet to take place. Where is Christ today?
Romans 8:33 Who shall lay any thing to the charge of God's elect? It is God that justifieth.
34 Who is he that condemneth? It is Christ that died, yea rather, that is risen again,
who is even at the right hand of God, who also maketh intercession for us.
35 Who shall separate us from the love of Christ? shall tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
Ephesians 1:20 Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places
Colosians 3:1 If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God
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:
and 13 But to which of the angels said he at any time, Sit on my right hand, until I make thine enemies thy footstool?
Seems Christ is never said to be sitting on His Throne of Glory or any other throne in Heaven but is by His ?Father until The Father makes His enemies His footstool.
Look at 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;
and 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.
Everything says He is set or set down on the right hand of the Throne of God
Notice
Revelation 21:5 And he that sat upon the throne said, Behold, I make all things new. And he said unto me, Write: for these words are true and faithful.
6 And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.
Revelation 22:And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.
2 In the midst of the street of it, and on either side of the river, was there the tree of life, which bare twelve manner of fruits, and yielded her fruit every month: and the leaves of the tree were for the healing of the nations.
3 And there shall be no more curse: but the throne of God and of the Lamb shall be in it; and his servants shall serve him:
Now we see the Lamb on His Throne, this is after the Great White Throne Judgement after the renovation of the earth and the New Jerusalem has come down and is setting upon the new earth. Then we see the lamb on His Throne.
Of course Revelation 20:4 And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.
5 But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection.
6 Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
7 And when the thousand years are expired, Satan shall be loosed out of his prison,
8 And shall go out to deceive the nations which are in the four quarters of the earth, Gog, and Magog, to gather them together to battle: the number of whom is as the sand of the sea.
9 And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them.
According to verse 9 this Kingdom is upon the earth, the camp of the Saints in the beloved city, verse 4 says they are living and reigning with Christ their camp in verse 9 again says it is up on the breadth of the earth in the beloved city. This takes place after they have ruled 1000 years. Scripture makes it clear.