That's all you need to do. When you open Core, you should not see any out-of-sync overlay or a green bar at the bottom. If you hover over the checkmark at the bottom right hand corner, it will tell you how many blocks it has synced. Compare that to a block explorer to check if you are in sync.
If Core is in sync, then Armory somehow got off sync. With Core running, start Armory. Go to Help > Rebuild and Rescan Databases and click Yes. Then restart Armory. This should fix your problems.
thank you for the answer.
My logical mind is telling me you are of course right.
Just did that... waiting till it builds, shows as 22% 25 more minutes now.
It solved my problem. Thank you again.