I'd be surprised if CAS informs either party before the other and probably only 24-48 hours before it being public. I think this leaves us to read between the lines as to confidence.
UEFA have been really tight - no public rumours at all as far as I have seen - if they have said things to journalists I haven't heard it or seen on it Twitter. Not heard any of the usual suspects in the media give any feedback on how UEFA feel.
From City, a couple of people have said the vibe internally is positive but who knows if that is new news or parroting the strident views of the club pre-CAS. There have been no positive signs on transfers which is a lead indicator - I don't think we are currently acting as if we know we are clear. Likewise with Pep contractually (no decision, no positive noises) and his tone is generally downbeat(ish) or neutral (good external reasons for that of course).
I think, on balance, at this stage, the parties simply don't know.