The kingdom has been established, that is not a this-earth kingdom, Jn 18:36, and as discussed in the previous post.

Jesus has all the attributes of a king.

He has sat down on His Father’s throne in heaven.

“He who overcomes, I will give to him to sit down with me on my throne, as I also overcame, and sat down with my Father on his throne.”
Rev 3:21 WEB

The “sat down with my Father” is a Greek aorist-active-infinitive, and is correctly translated as “sat down,” a past event.

Besides having a throne over Israel, and indeed over the entire earth, Jesus has all of the authority He needs.

“… “All authority has been given to me in heaven and on earth.””
Mtt 28:18 WEB

This power is verified in more than one place. The Father has given Jesus authority over ALL flesh, Jn 17:2. Further, “The Father loves the Son, and has given ALL things into his hand,” Jn 3:35 He can do anything He wants with anyone or anything.

He rules NOW until …

“24 Then the end comes, when he will deliver up the Kingdom to God, even the Father; when he will have abolished all rule and all authority and power. 25 For he must reign until he has put all his enemies under his feet. 26 The last enemy that will be abolished is death.”
1Cor 15:24-26

The phrase “must reign” is a Greek present-active-infinitive, indication actions going on continuously in the present, until all of His enemies have been put down.

And Jesus making men citizens of His
kingdom NOW.

We Gentiles were at one time alienated from this kingdom.

“that you WERE at that time separate from Christ, alienated from the commonwealth of Israel, …”
Eph 2:12

The word translated as “ commonwealth” in many translations, is the word politeia, which is talking about citizenship, being part of a certain political unit. We gentiles (the nations) are now a part of the political unit, this kingdom of which Christ is the King, this commwealth if you will.

“13 But now in Christ Jesus you who once were far off are made near in the blood of Christ. 14 For he is our peace, who made both one, and broke down the middle wall of partition, 15 having abolished in the flesh the hostility, the law of commandments …”
Eph 2:13-15 WEB

Jews and Gentiles in Christ are now citizens
of the same political unit.

“19 So then you are no longer strangers and foreigners, but you are fellow citizens with the saints, and of the household of God, 20 being built on the foundation of the apostles and prophets, Christ Jesus himself being the chief cornerstone;”
Eph 2:19-20 WEB

You “are” “Fellow citizens” sum-polites a word that is a combination of sum with, and the word for citizen polites.

The kingdom is NOW!

Men are getting in on the ground floor of the only eternal kingdom. The kingdom which will rule over ALL of the New Heavens and New Earth, Isa 65:17, Rev 21:1-2, 2Pe 3:13.

WEB is the World English Bible, a copyright free revision
of the original ASV American Standard Version 1901