Samsung is now rolling first One UI beta update to the Galaxy Note 8 users that bring features improvements. It includes the January 2019 security patch. The update is now available in Korea, UK, and India.
As the first recipient of the One UI beta test, the update is currently rolling out with build version N950FXXU5ZSA5, while the size of the update is 1856 MB.
If you have installed the beta build on your Galaxy Note 8, you can check for the update manually by heading into the Settings > Software updates > Download updates manually. This will allow the software to update and load the beta version.