Samsung has started the roll-out of the One UI 3.1 update for the Galaxy S20 phones, Galaxy Note20 devices, and the Galaxy Z range. While these Samsung Galaxy smartphones will receive many of the features Samsung One UI 3.1 has to offer, there will be no support for Google Discover, which is available on the Galaxy S21 series.
https://www.notebookcheck.net/Samsung-rolls-outs-One-UI-3-1-update-for-Galaxy-S20-series-Galaxy-Note20-range-and-Galaxy-Z-lineup-but-not-all-the-features-found-on-the-Galaxy-S21-phones-will-be-present.522728.0.html