When the scriptures talk about no man can see the kingdom without being born again there at least three possibilities.John 3:3
1. That Jesus is talking about heaven and literally seeing it after you die.
2. He’s talking about the Jewish concept of and earthly Kingdom and literally seeing it some time in the present or future.
3. He is using a metaphor to explain that people need a change of mind and heart in order to see figuratively what God is doing in the present.
I know that #1 in many circles is the only answer, but any far look at this section of scripture could come to another conclusion honestly.