The Steam Deck is on track to reach gamers by the end of February 2022, Valve has confirmed. It is also incentivizing developers to optimize their titles for the handheld as a part of the "Steam Deck Verified" program.
https://www.notebookcheck.net/Valve-confirms-that-the-Steam-Deck-will-start-shipping-out-by-the-end-of-February.592757.0.html