I think all football fans will agree if I say that the FA Cup final is 99% certain to be the Manchester Derby - Manutd vs Mancity.
And Mancity will definitely be the favorite to win the FA Cup, while for Manutd - the Fa Cup is the last chance to win a trophy this season.
Even it is impossible, I do hope to see Manutd able to win this one.
Three Premier League teams and one champioship team will enliven the FA semi-finals this season, in addition to the semi-finals of course our main focus will be on the final later which will most likely be as you said nnamely the Manchester duo will meet in the final, the first team that has a great chance to reach the final is of course Manchester United if indeed they can maintain the game like yesterday, Then they will easily beat Coventry in the semi-finals, Coventry game so far I don't think it looks special and even when they beat Wolves back then, I think the game shown by Manchester against Liverpool yesterday was the best game I have seen so far from Ten Hag squad.
As for Manchester City and Chelsea, I don't think there are any members here who doubt that Manchester City will be able to beat Chelsea in the semi-finals, not to underestimate Chelsea but the fact is that Chelsea this season is not worth expecting so far Chelsea have had a poor performance in the league and even when they beat Leicester it looks quite difficult and maybe even Chelsea fans today will not hope if Chelsea can beat Manchester City in the FA semi-final match later.
Indeed, all possibilities can happen in the semi-final match later, but I personally see a very small chance that Chelsea and Coventry will be able to continue their fight until the final, which is why I am quite optimistic to see the Manchester duo will fight at Wembley stadium later.