Luke 17: when does the kingdom of God come?

That was the question of the Pharisees to Jesus:

20 Now He was questioned by the Pharisees as to when the kingdom of God was coming, and He answered them and said, “The kingdom of God is not coming with signs that can be observed; 21 nor will they say, ‘Look, here it is!’ or, ‘There it is!’ For behold, the kingdom of God is in your midst.”

Did the kingdom of God? I believe so. The kingdom of God is here in our midst. However, there many things that show us how the will of the Lord isn't done nowadays. The Lord Jesus will return. He says it in private to his disciples:

22 And He said to the disciples, “The days will come when you will long to see one of the days of the Son of Man, and you will not see it. 23 And they will say to you, ‘Look there,’ or, ‘Look here!’ Do not leave, and do not run after them. 24 For just like the lightning, when it flashes out of one part of the sky, shines to the other part of the sky, so will the Son of Man be in His day. 25 But first He must suffer many things and be rejected by this generation.

Thus the kingdom of the Lord is in our midst, in the midst of the believers, but Jesus will come back and settle the kingdom in a very visible way. May the believers shine with Jesus on the glorious day.