Barcelona needs more time to win the Champions League. I don't think they can win the champions league this season. Since it is a young team, the harmony of the players will increase over time. They may be playing well for now, but their performance may not be sufficient at the Champions League level.
This is not a criterion because the victories they won in the groups were not difficult matches. There are much better teams than Barcelona and I do not give Barcelona a chance this season.
It's true, the current Barcelona squad is not yet mature enough to win the Champions League title and even though it has several experienced players, complete maturity is still needed if you want to win the title. Barcelona has been on hiatus for 7 years in the race for the Champions League title and even now they still don't look like a strong candidate to win.
The group phase is the easiest place for them to qualify and moreover they are in a group filled with teams that are not that strong so to advance to the round of 16 it would be very open, but if they were to be in the quarter finals it would be very difficult for them face other strong teams.