Just a day after the One UI 3.0 beta for the original Galaxy S20 trio went public in South Korea, Samsung started rolling it out to users in the US as well. Soon, the update should also reach Europe (Germany, Poland, the UK), India and China.
Going back to the US, only T-Mobile users seem to be getting the update right now, but that’s likely due to the staged nature of the rollout. You can use the Samsung Members app to subscribe to the beta channel and get this update. You will be trying out Android 11 + One UI 3.0 ahead of other users, the changelog is pretty extensive so there is a lot to see.
Note that the beta is not free of bugs, but you have the option to roll back if the issues prove too bothersome. Just make sure to back up your data first.
Here’s a screenshot from one Samsung Galaxy S20 Ultra 5G user that lists the changelog in full. This update weighs almost 3 GB and also includes the October 1 security patch. Galaxy S20 5G and Galaxy S20+ 5G users can join the beta testing as well.