The new build, which contains the January 1, 2020, security patch, brings Android 10 one step closer for Samsung's soon to be two-generations old flagship. The third One UI 2.0 beta should be rolling out to enrolled handsets globally within the next few days.
https://www.notebookcheck.net/Android-10-edges-nearer-for-the-Samsung-Galaxy-S9-as-One-UI-2-0-enters-its-third-beta.448140.0.html