This was the headache I was getting also. I was fearing the delivery date would slip a week or more. (Which clearly isn't the case still as of 5:30 ET).
Also feared every time I "Placed Order" , enter security code....the order
really did go through and I just bought 25-30 iPhones. 😆
Gave up on the app, the order went though on my desktop when the store finally came up on my end...after stopped showing "Almost There" screen around 8:11am. Order placed 8:14am. Delivers 11/13
Never had issues with the Apple Store app until this morning.
\