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Sometime between 1030 and 1040 AM EST. Sadly I didn't get a picture of the moment and my bank didn't show transaction times (only day). I got pictures before and after, lol.
If you are looking at the window when you can actually configure, I think the AWD time frame of Mid 2018 is when Tesla anticipates to start production, not when your own estimate is for. You need to check the MyTesla Estimator with the blue box around it. Mine went from Aug-Oct 2018 to Late 2018 (owner but at end of owner reservations), but being late owner I think owners who deferred for AWD before me will get deliveries before then. Hoping for our number to come up in fall before winter sets in...more fun to drive then!