Is There a Way To Determine When the Save Game Process is Over For Displaying A Save Game Icon or Warning

Is it possible to determine when the saving process ends, so that a save game icon (such as a disk image) or warning not to turn off the computer can be displayed, and then removed when saving has completed?

I also wanted to avoid players pressing the save button multiple times too quickly, in case that interrupts the initial save process. Although I’m not sure if that can happen.