NYS is a closed primary. Registration I believe is already closed.
Cruz will get many traditional Rush/Levin type of conservative Republicans. Kasich will get the GOPe types. Trump won't get to 60%, it will be close to 50%.
That’s not what the NY polls have been showing. Trump’s been polled at 64% and up 52% over the next contender in NY. Trump will get his 50% plus of the vote and may push 60%.