Most likely so, if there are no surprises then Real Madrid and Napoli have a big chance of qualifying from group C because in terms of quality Real Madrid and Napoli are much better than Braga and Union Berlin.
Don't underestimate Braga, they have a chance because Napoli isn't really good with their new manager, while Union Berlin has no chance because they're lose streaks in Bundesliga.
In the 3rd and 4th matches, Galatasaray will face Bayern Munich and Manchester United will face Copenhagen. And most likely Bayern Munich will beat Galatasaray in both matches. If Manchester United can beat Copenhagen in these two games, Manchester United can finish on 2nd position. But Manchester United's performance is very unpredictable and have self-confidence problems. Also Manchester United midfielder Casemiro was set for a game suspension after being red card in the Galatasaray match.
It's too naive to think like that because the league is still long to go, I could say Manchester United will win every matches and Bayern Munich lose all the next match, Manchester United will finish on 1st position.
Yes, maybe you are right. 4 more matches will be played. As you said, Manchester United will win these 4 matches and Manchester United will finish on 1st position. But right now, as I said, things are not going well for Manchester United. Casemiro is suspended due to a red card. There are many injured players. Also Manchester United's performance is very unstable.