From all analytical and statistical point of view the cup is PSG's. If they could humiliate Real Madrid to a point where they had to concede three goals in less than 25' of game play and the last goal in the 87' of the second half, then Chelsea will have to work even more harder to avoid been embarrassed as well.
Bold of you to write off Chelsea from this tittle and conclude the Cup is for PSG. I know we can not deny the fact that PSG is good at the moment and stand the high chance to win this Cup but it's very unfair to just assume that Chelsea has been defeated even before the game. Football is a game of chance and it's not the best team that always win. This is what makes football to be unpredictable most of the time.
Real Madrid is not in their best form at the moment but yet, they have eliminated Juventus and won some matches in the group stage as well. PSG lost a match in the group stage to an underdog likewise Chelsea. In as much as PSG is the favourite here, I don't think they can snatch it away from Chelsea easily like that.