Would it be possible to add a status message for when the config has been saved successfully?

I have a few older/slower PCs. When I save the configuration on those in Grub Customizer I often walk away and do something else because it takes a while.
The status bar at the bottom shows updates while it's saving, but once saved (successfully) the screen looks exactly like it did before saving.
Would it be possible to add a status message to confirm that the config has been saved successfully?