One UI 4.1 for Galaxy S9, Galaxy S9+, and Note 9 comes with NOBLE ROM 2.1 and above : r/GalaxyNote9
Galaxy S9 One UI 2.1 update slated for June release in Korea - SamMobile
Car Charger for Samsung Galaxy S9, S9+ Plus - 2.1A Type-C Car Charger with Extra USB Port (8 feet) and Atom Cloth for Samsung Galaxy S9, S9+ Plus - White - Walmart.com
Writenaregiven - Galaxy Note9 got One UI 2.1 and the Galaxy S9 will get it too [expectedt next week] | Facebook
Samsung One UI 2.1 Update Devices: Note 9, Galaxy S9, More - SlashGear
Samsung Galaxy S9 and Note 9 receive an upgrade to One UI 2.1 - Task Boot
Galaxy Note 9 and Galaxy S9 May Not Receive the One UI 2.1 Update