https://wccftech.com/galaxy-s21-series-now-receiving-the-one-ui-4-1-update/

It has been less than 24 hours since Samsung started delivering the One UI 4.1 update to the Galaxy Z Fold 3 and the Flip 3 and now, the Galaxy S21 series in parts of the world is also receiving the One UI 4.1 update. This just goes to show Samsung's commitment to be sure that they are delivering the updates on time and making the overall experience easier and much better for everyone.

The update started with the Galaxy S21 on Rogers but now, more and more versions are receiving it. Remember, the update is currently rolling out in Canada, so it is highly likely that your region has not received it. I checked it in Pakistan on my Galaxy S21 Ultra and I still have not received the update but it is only a matter of days for the update to be available everywhere.