In the past we had the status updates in the bottom tray and no one noticed them.
Because they were in 6pt type, white on grey, and faded out in a second !!
But this is not a mobile or web app. It's a desktop tool.
No big deal. I just wanted to point out that "no one noticed them" begged the point.
A disk icon that goes grey when the project is clean is pretty standard.
Or put the status message in the status bar, and clear it when a new operation is initiated.
No need to re-invent interfaces here.