Within minutes of Apple accepting pre-orders for the iPhone 15 series, the iPhone 15 Pro Max was sold out. If you order now, the delivery date will be postponed to October. Apple pre-orders started late — about two minutes late in the U.S. and about six minutes internationally — but within a short period of time, all iPhones were listed as shipping on September 22. That was a date announced by Apple, but not a specific date, which has been the case for a long time.
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Apple Online Store (China)
A while later, the iPhone 15 Pro Max delivery date changed to "7-10 days," which still could mean September 22, but almost certainly isn't.
Then half an hour before pre-orders opened, the delivery time of iPhone 15 Pro Max was postponed to "2-3 weeks."
As of this writing, the iPhone 15 and iPhone 15 Plus are still available to ship next Friday. The iPhone 15 Pro briefly and strangely changed to "5-7 days" but now says "7-10 days."
These are the dates for the base configurations of each iPhone 15 model, as well as the first color options listed by Apple. However, all colors and all configurations of the iPhone 15 Pro Max (including the 1TB version) are now out of stock.
Apple has never released sales data, nor has it released production data, so there's no real way to know whether the iPhone 15 Pro Max is selling faster than expected.
However, you can know that if users still want to get it before October, they need to try to go to an Apple retail store on Friday, September 22, 2023.