In Chapter 8 of Paradise Restored, David Chilton discusses what it means that Christ is King and ruling in His Kingdom. Like a stone that becomes a mountain and like a seed that becomes a tree, Jesus' Kingdom is growing and increasing day-by-day. Jesus is seated on His throne and is ruling at the Father's right hand right now. With His atoning Death and subsequent Resurrection, Jesus has bound the strong man (Satan) and is plundering his house.

It's Kind of a Funny Story article here: https://americanvision.org/posts/it-s-kind-of-a-funny-story/