Since Manchester City, Real Madrid and Bayern Munich are the favorites for this cup, we can say that they are the strongest teams for the UCL championship. Harry Kane has been playing brilliantly for Bayern Munich so far. Of course, there is a possibility of winning the cup. He plays in a team that can even win the UCL cup.
Yeah one of the club among the three you listed will surely become the winner of the trophy this season because Manchester City, Real Madrid and Bayern are the only best team qualified to win the trophy.
But however judging base on performance Bayern Munich has more upper chances of winning the cup because they have been winning almost all there matches, also Harry Kane has been playing very well on Bayern Munich, perhaps I was thinking that his performance will be a bit low after leaving Tottenham Hotspur but it seems he is performing the same way he was known for.