I just did this. Didn't know it was an option. Ordered 16" M1 Max, 32-core GPU, 32GB RAM, 2TB SSD. Mine is scheduled to deliver November 3-5, with the "ships in" window of 5-7 business days. My delivery date still shows at the same, but the Apple rep said that changing to express delivery will make the delivery time 2-3 days after it ships... so in theory this can mean that I can get it next week instead of November 3-5? Not sure if this (free) supposed delivery change actually changed anything, so I am not getting my hopes up. But worth a shot for anyone with a delivery window after launch day.