https://arstechnica.com/gadgets/2023/09/iphone-15-and-iphone-15-pro-launch-today-if-you-can-find-one/

Today marks the in-store launch of the iPhone 15 and iPhone 15 Pro, plus the likely delivery date for at least the earliest preorders. Preorders went live a week ago, on September 15.

You'll be waiting for a while if you want the Pro model and didn't preorder, though.