I got mine within 1 min of the order
When you completed the order did it say it went through and gave the order confirmation number on the top right? If it did I'm sure you're fine and I'd just wait till the order status goes live and give it a go then.
You could also double check your account information to make sure your email address was entered correctly
I ordered via my phone and it did give me a success message. But I don't trust Apple Pay, Barclaycard or the Apple Store app.
Got the confirmation email at 08:02 for order placed at 08:01