I don't know if I'm allowed to put links but it's on the r/GalaxyS21 subreddit.
Oh and here is the release: One UI 4 Update Delivers an Elevated Mobile Experience Centered Around You – Samsung Newsroom Canada
Thanks for your posts! Regretfully, we do not have any recent updates to share at this time but if any new info becomes available, we will definitely update the OS Upgrade Schedule found here. If you scroll down, you can also find more info on how the process works there as well. 🙂