Although its developer conference was very much focused on the foldable phones of the future, Samsung hasn't forgotten about the devices that are already on the market. So it announced that it will be releasing updates to Android 9 Pie for the Galaxy Note9, S9, and S9+ in January. An open beta program for the new release will become available later this month, but initially this will only be available in the US, South Korea, and Germany. The beta should head to other European and Asian countries at some later point. One UI, the company's new skin on top of Android (bye-bye Samsung...
Source: https://www.gsmarena.com/samsung_promises_android_pie_update_arriving_on_galaxy_note9_s9_and_s9_in_january-news-34114.php
