The Galaxy S9 is a 2018 flagship. Nevertheless, its maker Samsung has reportedly updated it with the latest Android security patch. The more recent premium mid-ranger the Galaxy S20 FE has joined it in this respect.
https://www.notebookcheck.net/Samsung-updates-the-Galaxy-S20-FE-and-S9-series-with-December-2020-security-patches.507576.0.html