It’s been my experience that if you don’t get in on the first minute of opening sales then yeah you’re gonna have to wait about a month, though it doesn’t always go that long, even if they estimate it to.
The store took about 20 minutes to come online for me. But I ordered a 128GB, Natural Titanium 15 Pro that will be available for me to pick up on launch day. Excited to replace my 12 Mini.