I think Mbappe or Messi since their national teams could play longer than the others. For Neymar I think he will have many forwarders playing with him that will take a part from his goals.
CR7 I don't expect much from him and Portugal. I prefer to be wrong and see them playing good..
We can't ignore Harry Kane from England either for the chance to score the top goalscorer at this World Cup.
Ronaldo, Messi, Mbappe, Neymar, Benzema, Lewandowski, Eden Hazard we can name players who will be included in the line-up by the coach, but names like Christopher Nkunku (France), Lautaro Martinez (Argentina), Youssoufa Moukoko (Germany), Ansu Fati (Spain) should not be ignored in the list of potential top scorers if given the opportunity by their coach.