He still has ballistic missiles that could (in theory) hit parts of the US, but he's likely a few years away from miniaturizing a nuke enough to arm one of them. Personally, I think the bigger threat from him will be down the road, when he has more directed EMP weapon capability. For now, he's more of a regional boogey-man.
I know we Americans like to think we could bomb anyone into the stone age, but NK is a bit of a different animal. He's dug in DEEP, and though we have things that would take out bunkers, it wouldn't be an easy one. We'd win, of course, simple numbers and how much we spend, but we'd have to do so at a cost.
Plus, there's the added bit that he's nuts, and not living in the same reality we are. China is kind of forced to put up with him, as their buffer to the West, but even they tire of him. I can't believe they haven't staged an internal coup yet, to be honest....but it's likely coming. It's what I'd do in their shoes.