It looks like the stable Android 10 release for the Galaxy S9 and Galaxy S9+ is still some ways off, as Samsung has released a new Android 10 beta update for the two phones. Software version G96*FXXU7ZTA2 is now rolling out to the Galaxy S9 and S9+ in India. It should also be available in other markets where the beta program was launched.
The new update brings a handful of bug fixes and the January 2020 security patch (which was also included in the previous beta update). A bug that seemingly locked people out of the Secure Folder on their device has been fixed, along with unwanted noise when “performing sound quality optimization” with both 3.5mm and USB-C headphones. The update also improves camera performance and motion recognition when navigation gestures are active; it also brings an updated version of Digital Wellbeing.
If you are using the Android 10 beta on your Galaxy S9 or S9+, you should be able to download the latest update over the air right away. Just open the phone's Settings app, select Software update, and tap Download and install. Don't forget to backup all important data before performing the update, as there's no telling when something might break and require you to reset your phone to get it working again.