So quoting this, because I think there are many others in the same boat (including me). So I talked to Amazon about this. But basically long story short, normally UPS related packages go from Amazon warehouse to close by UPS hub, then transited over to the recipient's closest UPS hub, then delivered locally. But in the case of the PS4s they are skipping the initial step of going to a UPS hub closest to the amazon warehouse, and straight into transit from Amazon's warehouse, hence the packages haven't been checked into UPS system yet.
In this case the initial step is being skipped and straight into transit because its not necessary since the entire truck is full of the same commodity (PS4s) and going to a specific regions UPS hub. It would be completely unnecessary to go to a local UPS hub from Amazon, since there is no sorting of packages needed. So when the truck reaches your local UPS hub, that is where it will be likely checked in and updated in UPS's system. Also because these are for release day guarantees as well as the logistics involved in such a huge quantity, any steps that can be skipped to guarantee release day delivery will likely have been taken. Hopefully this help others in the same situation.
FYI, I'm in the Bay Area with a KZSF launch day bundle.