If one of the other VOPP is currently being used, e.g. Global Search and Replace, AutoExport will wait for it to be finished prior to executing. At these times the VOPP tray icon will change, displaying a flashing clock face, and if you place the mouse cursor over the icon, display a message:
If VO is running and an AutoExport occurs the VO title bar will change, showing the name of the current application being exported.
If you have AutoExport configured to export when VO shuts down you will first see a countdown window giving you an opportunity to cancel the autoexport:
Then the window shows the name of each application as it is exported: