The Android 10-based One UI 2.0 beta program for the Galaxy Note 9 has been launched in India today and will soon be coming to the US as well. The Note 9's One UI 2.0 beta debuted in the UK and South Korea last week, and earlier today, the One UI 2.0 beta was also released for the Galaxy S9 in India and South Korea. At this time, it's unclear if the Note 9 or S9 betas will be expanding to markets like Germany, where both the Galaxy S10 and Note 10 Android 10 betas are available.
Galaxy Note 9 owners in India will be able to grab the Android 10 beta update from their phone's Settings » Software update menu after enrolling in the beta program via the One UI beta notice in the Samsung Members app. The first beta build that's rolling out in the country is the same one that Samsung released as a hotfix in the UK and South Korea yesterday (build number N960FXXU4ZSK7). It's a 1930 MB download and includes the November 2019 security patch.