The group stage is going to go on very comfortably for Real Madrid. We must have all understood it from their winning against Napoli away recently. That was technically the toughest match of the group. But even Napoli couldn't stop them in Naples. I can already be confident that Real Madrid will finish as group leader.
The important point is what they will do against the biggest title contenders. Especially against Manchester City and Bayern Munich I mean. If they manage to show a strong team performance with the help of their main scorer Bellingham too then I wouldn't be surprised to see Real Madrid adding another CL title to their collection.
So far there has been no big challenge for Real Madrid in facing opponents in the Group stage and even Napoli, which was previously considered to be a balanced opponent, was unable to face Real Madrid even though the match took place at Napoli's home ground. It is almost certain that Real Madrid will be at the top of the Group standings because their next opponent will be much easier in the remaining matches.The important point is what they will do against the biggest title contenders. Especially against Manchester City and Bayern Munich I mean. If they manage to show a strong team performance with the help of their main scorer Bellingham too then I wouldn't be surprised to see Real Madrid adding another CL title to their collection.
We will see after the group phase ends and who will be Real Madrid's opponents, the round of 16 to the round of 8 will be even more competitive because they will meet strong teams before heading to the semi-finals. If the two teams you mentioned can advance to the semifinals, that would be much better because it would produce quite an nerve-wracking match.