In a different thread about this, someone said
"Anyone worrying, it was just an update and a dev accidentally pushed out a wrong notification. These updates are meant to be stealthed. It's good, it just means it was retrieving your phones last location since update was done."
I received the same notification. I manually updated the find my mobile app yesterday from the Samsung galaxy store. The notification came in sometime last night. Running services shows the main process in use is the Samsung cloud remote backup/sync service.
Thanks to you and everyone posting about this I don't have to worry so much. There are some powerful tools in there.
Galaxy S9 SM-G960U
Security Patch Level
December 1st , 2019