Weeks before the deadline, Samsung started seeding the latest Android 9.0 Pie update along with its brand new custom One UI for the Galaxy Note9. And that's the stable version we are talking about here. The OTA update weighs in at just 95MB, but we assume that the screenshot was taken from a user that participates in the beta program so if you are coming from a stable Android Oreo, it should be way bigger. For now, we have information about the update being live in Germany, so it will probably take some time to make it to your handset as well. Just like the Galaxy S9/S9+ update...
Source: https://www.gsmarena.com/samsung_galaxy_note9_starts_receiving_stable_android_pie__one_ui-news-34935.php
