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10PM local time - the button on the iPhone page went grey to blue but at checkout you couldn't choose pickup at store.

10PM PST - you could choose pickup at store regardless of your time zone
 
I'm in MD, no stores around me had inventory or the option to pickup until 2:30 AM. At that point, no 16 GB phones were available within (I'm assuming) at least 500 miles, not even as far as NY. I was able to pick up a 32 GB at that point at a store about 45 minutes from me, and it's now available for pickup!
 
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