He is not on David’s throne, as was prophesied
Luk 1:32 - He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David:
Peter disagrees with you in Acts 2:29-36, saying: “Men and brethren, let me freely speak unto you of the patriarch David, that he is both dead and buried, and his sepulchre is with us unto this day. Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne; he seeing this before spake of the resurrection of Christ” (Acts 2:25-31).
The whole context here is expressly speaking about the One that would assume David's throne. It is speaking about the only One that could gloriously take it. Christ was that man. He was of course the promised offspring of David (the fruit of his loins). None else would take such a final place of authority. Christ was indeed the fulfilment of the Davidic promise. He now reigns supreme.
Christ already came physically and revealed the kingdom of God to Israel. The problem was, it just wasn't what they expected. The fact is the Messianic kingdom is here. Messiah has come. The kingdom is found everywhere Christ reigns in sovereign control. The kingdom is here on this earth now in the hearts of God's people (the Israel of God).
Peter shows us that Psalm 110:1 is currently being fulfilled since Christ destroyed the power of the grave, and ascended to the right hand of majesty on high. No objective Bible student could fail to see the focus and message of this narrative. This reading is concentrated upon the victory of the resurrection of Christ nearly 2,000 years ago and the resulting current kingly Messianic reign of Christ at “the right hand of God exalted” in heaven. It confirms that Israel’s Messiah now sits enthroned upon David’s throne, and locates the timing of His assumption of the same to after “the resurrection of Christ.” As Messiah, Christ fulfilled every human demand of Him, thus rightfully assuming the kingship of Israel through His impeccable life, His atoning death and His glorious resurrection.