Patience my children
Don't be worried about receiving your email in the next few minutes telling you it's ready. Remember an employee has to retrieve the sticker with your info, attach it to your items you purchased, set them aside in a special spot, then update the system that yours is set.
In reality, I would be surprised if you receive it prior to 7am EST as staff will be really busy this morning. I am sure most stores have people dedicated to this but no need to start blowing up posts with "oh gosh, i have not received my email"
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Is it seriously not possible to buy a factory unlocked cellular iPad in the US for full device price?
Sure it is!! Order TMobile. It comes with the air card you never have to really activate.