I think it would come down within an entire SteamOS update. Valve should give it some time in Testing before they push it to everybody in Stable. But they have been known to yolo some really wonky builds on a Friday afternoon and leave your Deck broken all weekend.
Is this something that will be pushed to Steam Decks automatically?
I would expect so. It might already be on the Deck, as sometimes Valve is ahead on kernel and firmware related issues.
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I think it would come down within an entire SteamOS update. Valve should give it some time in Testing before they push it to everybody in Stable. But they have been known to yolo some really wonky builds on a Friday afternoon and leave your Deck broken all weekend.