I think think that South Korea is prepared for NK. They just don't say much. They have a new president who sounds like a smart stable guy. Biden called him 30 minutes after he won the vote.They put more warships through the Taiwan Strs. yesterday and more overflights with war planes.
We probably won't hear much from Xi until he says, "Go". He's not one to telegraph is movements.
A bigger worry right now would be N.K doing something stupid which would directly bring US into a desperate fight overnight.