Yes, the newly released version 4 includes this feature. You can check the statement below as taken from the developer's website:
"Include clock: View a clock with the current time or screensaver running time to tell how long you've been away from your computer. The clock can also be disabled."
To have this function, remove the currently installed version and download the new one: http://www.abscreensavers.com/random-photo-screensaver/