Lewandowski scored 19 goals in 35 matches last year, but this season he has reached 14 goals. This number of goals is quite good. Considering that there are still 26 matches left in the season, if he plays in 26 matches, he can probably pass the 30 goal threshold. However, you may be wrong about Mbappé. Mbappé is a very talented player and may explode later. He has only scored six goals so far, but he is a player who even has the potential to score a hattrick. If he scores a few hattricks in a few matches, he can be at the top of the scorers list.
Lewandowski's performance is much better than last season and the goal statistics he has scored are also quite good this season so there is a big possibility that he will be one of the top scorer candidates at the end of the season. Hansi Flick is able to develop the best potential that Lewandowski has so that so far his productivity in scoring goals continues to improve and the average victory obtained by Barcelona is also quite promising this season.
Mbappe has not been as prolific as he once was and may need to adapt better to get the chances to continue scoring goals. He is talented and has the skills to score goals but he is not at his best at the moment.
It's not only Lewandowski started to play better, but the whole team is now playing the attacking soccer that Barcelona was famous for. Perhaps for the first time in several years there is a feeling that Barcelona is a real top club, which few teams can beat and Barcelona players now score a lot of goal each game that shows us that they are confident.
Along with Lewandowski, Rafinha has become a real goalscorer, and there is also Dani Olmo, who is just opening up and already scoring a lot and Yamal, who alone can create and realize a goal. So now with Flick, Barcelona is back as a top club, feared by all who will play with them.