Given how close he is to the other people running the football side of the club, and his personal relationship with the others, then I’d be surprised if they don’t already know of his intention.
Guardiola has already written off the league, so his concentration, and arguably that of the players, is now on the cups and especially the CL. Whether we can somehow remain consistent in the cups whilst inconsistent in the league remains to be seen, however. As I mentioned previously, how far we go in the CL could have a bearing on his decision. Should we win it, I could see him bowing out. Should we get very close, I could see him tempted to stay. Lose to Madrid and he might have a bigger and harder decision to make.