It's always possible, but I'd be surprised if they were in the US, even more so on an even lower margin product, unless AAPL (or UPS or FedEx) has an oddly large amounts of previously unknown free/sunk cost 3PL space and labor sitting around. UPS does offer next and second-day-air international direct distribution products, but, who knows, it is odd to not see any movement on those SKUs, but it is only Tuesday, and it's not unheard of to see ship-customs-out for delivery within 48 hours with UPS direct distribution.
But rumor has it they had lines running the the non-Pro models first, so maybe this was the case and there is room in Rialto or their PA facility where the labor is already a sunk cost to make this work!