As for Ronaldo, if Ten Hag didn't replace him in the second half then I think he would have scored too. Of course that would make it better.
Yep, there is no difficulty for Manchester United in this match to win. Apart from the dangerous chances they had, they also dominated the match in possession, 75% to 25%, it's like watching them play against a team that is in the third division of the league. Maybe there will be 1 or 2 more goals they will make in this match.
About Ronaldo, I'm not sure he will play the full game, Ten Haag has made 2 substitutions, maybe the one who will be replaced after this is Ronaldo.