The February 2019 OTA Security Update is available now. It is approx. 338 MB. Perform a manual check if you haven't received the notification.
I am wondering what the differences are this month. I've updated to the Security Update Patch, at first it seemed nothing much had changed. But when I looked this morning my battery said that it had 2 days left of power at 85% battery. Still wondering what else changed? ???