Give this a try: On the machine, press the Machine Status button, and then tap on the screen to select Information Pages followed by Configuration and finally Print. You'll then get a printed report.
You can view the supply status via the instruction in this link, you must be connected by ethernet. It may only show the % of the supply and not the page count itself.
I'm trying to find out how many pages have been printed by the installed toner on a WC 3615, but can't seem to find it. I've checked everywhere and get page counts of everything else, except of the toner.
Where can I find this counter?