Valve has updated the Steam Controller reservation system. Buyers now see an estimated delivery window directly on the product page.

Valve shows one of three windows:

Until September 2026 Until December 2026 2027 (more details to follow)

Existing reservation holders can log in to check theirs. New reservations are still open, though the current estimate puts new orders in 2027. Once you reach the front of the queue, you get 72 hours after the purchase email to complete the order - miss that window and you lose your spot.

Source: Steam