It's not live in the USyet. It will show as a banner in the members app when it is live. Samsung did not announce a day or time when it will be live, only that it was coming soon.
Could someone help me by pointing me in the direction of the OneUi Beta program? Thank you in advance.
Depends on the device but S10 models beta started a bit over two weeks ago. Beta for Note10 devices didn't start in the US and no official date yet.
Below is the link to welcome page and when new beta is available, new post will be created with the info about it: