The 1921 Census of England and Wales was released on findmypast.com on January 6, 2022, on the site: https://www.findmypast.com/1921-census
Frequently asked questions can be accessed here. On this page, under the question "Is there any way I can view the 1921 Census for free?", you can find:
"Anyone can view digital images of the 1921 Census of England and Wales for free on the premises at The National Archives at Kew [in London, England].... In addition, the 1921 Census is free to view via Findmypast at the Manchester Central Library, on St Peter’s Square, Manchester [England],... and at the National Library of Wales, in Aberystwyth.
For anyone accessing elsewhere, it is free to search the 1921 Census on Findmypast. Unlimited access to the records is available with a Findmypast Everything subscription or on a pay-per-view basis using Findmypast micropayments."