Everyone one was looking for the kingdom of God to come around the first century of our age. The Pharisees were repeatedly asking Him about it, much as in Lk 17:20-21. Jesus told His disciples,

“… “Most assuredly I tell you, there are some standing here who will in no way taste death until they see the Kingdom of God come with power.” ” Mk 9:1

So the kingdom was indeed to come soon, before all of them died, and it was to come with power. Then right before ascending to His Father in heaven, Jesus told his disciples to wait in Jerusalem “until you are clothed with power from on high.” Lk 24:49 WEB. He seems to be talking about the power with which the kingdom would come. Then in Acts 1 Jesus told them that, “you will receive power when the Holy Spirit has come upon you.” Acts 1:8. Then in Acts 2 the Holy Spirit came upon them with power and the kingdom of Heaven was begun.

A present embryonic kingdom!

The Father has,

“ … delivered us out of the power of darkness, and translated us into the Kingdom of the Son of his love;” Col 1:13 WEB

That’s right. It is past tense. We are now “fellow citizens with the saints,” Eph 2:19

Jesus rules ALL heaven and earth NOW!

All authority in both heaven and earth has been given to Jesus now, past tense, Mtt 28:20. Jesus is now, “the ruler of the kings of the earth.” Rev 1:5, present tense. So kings and judges are advised,

“Kiss the son, lest he be angry, and you perish in the way,
For his wrath will soon be kindled.
Blessed are all those who take refuge in him.”
Psa 2:10 WEB

So Jesus at present does indeed, “… Rule in the midst of your enemies.” Psa 110:1

How long with this rule over heaven and earth last?

“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 WEB

Some still look for Jesus reign on this earth for a thousand years.

Speaking of some saying Jesus will again be on earth, Jesus says something different.

“25 “Behold, I have told you beforehand. 26 If therefore they tell you, ‘Behold, he is in the wilderness,’ don’t go out; ‘Behold, he is in the inner chambers,’ don’t believe it.” ” Mtt 24:25-26 WEB

Some seem to think He did not mean that. But that is what He said!

You see, “flesh and blood cannot inherit the Kingdom of God,” 1Cor 15:50. The kingdom of God is not of this world, not of this universe, Jn 18:36.

And for a perfect place,

“Know this for sure, that no sexually immoral person, nor unclean person, nor covetous man, who is an idolater, has any inheritance in the Kingdom of Christ and God.” Eph 5:5 WEB

KJV is the King James Version, 1611

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

nf is my own translation based on the WEB