Phones from the most recent Pixel generation (and the Essential PH-1) have been reported as having received notifications to download the latest security patch for Android. Essential has noted that this update also contains other necessary additions such as bug-fixes. This patch may roll out to other devices later on, depending on their OEMs and carriers.
https://www.notebookcheck.net/Pixel-3s-and-Essential-Phone-are-now-receiving-the-February-2019-Android-security-patch.403471.0.html