The likelihood is that on the first ballot, if Trump is the only nominee, he will get the bound delegates and a fair portion of the unbound delegates and a fair portion of those bound to candidates that dropped out.
In other words, Trump will probably win on the first ballot, even if he doesn’t have enough bound delegates.
What’s more, it looks like Trump will win California and NY. Trump is going to go to the convention with enough bound delegates.
You’d better hope so, because if it makes it past the first ballot, he’s toast. And if he does get the nomination, it will be the biggest landslide since Reagan beat Mondale - with Trump playing the part of Mondale, not Reagan. When a Republican candidate can’t even win Utah, that is historic.