3NT seems a bit of a gamble but 4 of six pairs played there

With Clubs bid by South the ♥ 4 looks the best lead.

East will win with the ♥ K (never finesse against Partner!) and then has to think ahead

East wants the fourth Heart trick to be won by West so does best to unblock the Hearts by leading the ♥ J back.

Now it is easy for West to take the remaining Hearts and lead a Spade.