Again and again Valve has managed to speed up production of the Steam Deck, so much so that for reservations the Q3 era is over. Valve said that everyone who was inside Q3, would have gotten their purchase invite email today and so they're now speeding onwards into the Q4 window.

Hello, just a quick note about shipping today. As some folks on the internet have noticed (we see you Reddit!), we're speeding through reservations at an accelerated pace. This is due to increased production, and we've beaten our own estimates yet again. With today’s batch of emails we’ve now sent invitations for all reservations in the Q3 (July-September) bucket. Now that Q3 is done early, we're going to get a head start on the next set of reservations, and are fulfilling reservations that were scheduled for the Q4 window. We've updated the store page to reflect this, with an updated bucket description: September-December. That's it for today, more to come soon!

As a reminder, if you do manage to miss your email and Steam app notification somehow, you can still speak to Steam Support as you have a few days grace period on it.