Group HMan U vs. PSG
RBL vs. IBFK
RBL will most likely get all 3 points and have a total of 9.
And if PSG wins at Old Trafford, it will be:
Man U - 9
PSG - 9
RBL - 9
Assuming that ^ happens, I expect PSG to move to the next round as they face IBFK on match day 6. Man U and RBL will be a do-or-die match

Man United will likely win today's match against PSG. That should qualify them and with RB Leipzig having 6 points currently, they'd have to win against Istanbul and at least draw against Man U. I have a feeling both PSG and Leipzig will win against Istanbul in the next two matches, only reason why Man U lost against them the first time is because they're swinging between victories/draws and defeats this season.
That should send Man U and PSG to the round of 16 while Leipzig doesn't qualify for it.