I am thinkng about Cana again. In John 2:4, Jesus seems to rebuke His mother for pointing out the lack of wine, by saying "what have I to do with thee? My time is not yet come."
I think that this talk of "time" relates to the "now and the not yet" of the Kingdom of God. We have the opportunity to witness small parts of the Kingdom, such as the miracle at Cana and other wonder-working moments in Scripture and since the days of Scripture, but we don't have it all yet. We don't get it all until the end. The Kingdom in it's fullness is "not yet," but we get to see glimpses of "now" -- as if we reach into eternity and bring a bit of it into our realm.
So in some strange way, even though His time is not yet come, and still has not yet come, the Kingdom of God is nonetheless here and we can experience it's presence in our lives.