No, you're confusing two different distribution chains--Best Buy and Apple Stores. You can't pick up at any Apple stores because their initial supply is sold out.
No, Apple's initial supply can't be sold out if I can order online today for delivery on Friday. That is unless we each have a different definition of sold out.
Apple has suspended in-store pick up. NOT the same as initial supply sold out. You CAN buy a HomePod as of my typing this for delivery at homeTHIS Friday.