based on my info from UPS and I have connections being a former worker for them
Your father's brother's nephew's cousin's former roommate told you I'm sure..
UPS like every other company has contractual obligations, delivery by 10:30am happens to be one of them. While I'm sure some will miss that mark just due to the sheer quantity of items shipped I'd venture to bet the vast majority make the time as I'm sure Apple like most companies are making sure contracts they paid for are held in compliance.
That said, mine is out for delivery, woot!