I'm afraid you are not reading all the Bible, just selective portions. Paul's meaning becomes clear when you compare it with other passages:
"But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law," (Gal. 4:4).
Note the phrase "had come". It was obvious to Paul that the [dispensation of the] fullness of time was the present age in which we now live. My definition of "dispensation" is consistent with this truth.
Do you see the word King anywhere??? How about reign??? Jesus is sitting in Heaven as the High Priest...The Minister... He is not YET reigning as King...
You obviously do not understand that Jesus is a priest forever after the order of Melchizedek (Heb. 7:17). Who was Melchizedek? The king-priest of Salem (Gen. 14:18). If He is after the order of Melchizedek then He must also be reigning as King. This is the radical distinction between the old covenant priesthood and the new. And Christ’s disciples are also king-priests since we are reigning with Him (Rev. 5:10).
Peter confirmed in Acts 2 that Christ was raised up from the dead and seated on David’s throne in heaven, the proof of which was the pouring out of the Holy Spirit on Pentecost.
If Christ is not now reigning, then the gentiles have no hope (Rom. 15:12).
You must read all the Bible to get the correct picture. I’ll let you go back and factor in that additional info.
Why do you guys just make stuff up all the time??? He is not sitting on David's throne. He is sitting on the right hand of His Father's throne, until His Father sends him back to sit on David's throne in Jerusalem.