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The way the convention works (I think) is there will be a certain number of delegates, after delegate objections are handled. I think all states send a delegate and an alternate for each "slot," so the total number of delegates who make it through the objection/certification process is apt to be close to the theoretical number of 2473.

On the first ballot, votes will be cast for people no longer running, or who have no chance. That's because a combination of state laws and party rules bind the delegates on the first ballot. About 2473 votes will be cast on the first ballot. somebody may get a majority of them (I think so, I think Trump wins on the first ballot, by a comfortable margin). it is second and later ballots where Cruz's "stealing of delegates" has play. Delegates who were bound to vote for Trump on the first ballot would defect to Cruz, not giving Cruz the win outright, but denying an outright win to Trump.