After the rollout for Galaxy Note 8, Galaxy Note 9 has stepped-up to receive a new update that not only brings the latest security but also brings device stability and other improvements.
This update for Galaxy Note 9 brings April 2019 security patch that provides fixes to 15 new Samsung Vulnerabilities and Exposures items found in the recent software version. The update also installs bug fixes and device stability improvements.
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The build version for this update is - N960FXXS2CSD2 and it's currently rolling in Slovakia, Russia and more. If you want to check the update manually please go to the Settings > Software update > Download and install.