The Samsung Galaxy Note 8 received the Pie update in certain regions last month and Samsung is also now sending the March security to those models. Note 9 users in certain markets are also getting the security patch, interestingly, even ahead of the new Galaxy S10 phones.
https://www.notebookcheck.net/The-March-security-update-is-now-rolling-out-to-the-Galaxy-Note-8-and-Note-9-in-certain-regions.413901.0.html