Same here, sheesh, I got in around 3:08am on iPad Apple App and ordered 128GB iPhone 7+ Jet Black, availability went from Delivers 9/23 to "9/26 to 10/3" 1-2 weeks delivery by the time I checked out. Seriously, a Jet Black 7 Plus color shortage!
I figured not many would be ordering the bigger 256 size for 7 plus black, but I guess I was wrong. That or they instantly had a shortage since I got in the moment the site went live and immediately started checking out and I didn't see a 9/16 delivery. At least it's not too much farther. But I'm hoping it comes quicker than that.