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.
Harry Kane has found his rhythm again this season that 12 goals was belongs to him at premier league from 15 matches this indicated there is good opportunities to Kane will continue his achievement because he is England captain and always be playing regular and as top scores status on world cup 2018 he will counted as one of the players who scoring more goals for England for the current world cup and actually if we talking about England they are is not in the good shape because on Nation League this team has been relegated and from this tournament Southgate have to proven he can improved England performance moreover England at group B with Iran, United States and Wales which is on the paper England as the strong candidate qualified to the next round