Oh yes it received iOS 12.4.6 at the same time that newer iPhones received iOS 13.4.
Indeed, incredible support by Apple, that is an almost 7 year old phone now, absolutely amazing!
I took the update on my 5S the other day, I could have sworn they said updates were to stop but I’m sure it’s had two outside of its schedule, I could be wrong. Fun fact, I have 2x ATV3s and the newer 4HD.. the 3s have had 3 or 4 new updates since they said they would stop. This one added the tv app which I was surprised to see. I haven’t played with it at all, just needed it for YouTube and the kids.