The kingdom of God was cast into the earth in Christ. The Kingdom of God began to increase when Jesus walked the earth. There will be no end to the increase of God’s Kingdom, it will ultimately overcome all the world’s powers and take over the earth. See this article for the scriptural references for these statements.
God is actively speaking to us, leading us and revealing his will and character to us as he further establishes his Kingdom in the earth. Ultimately he is bringing all things together in Heaven and Earth together in Christ. Praise be to His glorious name forevermore!
The fascinating reality that follows these truths is that we’re actively experiencing God’s Kingdom now. You might say “I don’t feel like I’m in Heaven,” to which I’d say, it’s there, let me help you see it.