I think it really mostly comes down to location, popularity of the model you want, and determination (refreshing the in-store pickup stock often and being one of the first once it comes online).So what's the likelihood that I'll be able to walk into the Apple Store tomorrow and pick up a 13 Pro Max? I didn't preorder because I only buy unlocked iPhones and I want to trade in my 12 Pro Max to offset the costs.
Apple's website is telling me I won't be able to check stock until tomorrow.
If you live in a city with a global flagship store, you may be in luck tomorrow. If you don’t you will probably have to try a bit harder to be one of the first.