How to search the total usage for each search from all the different apps in our Splunk environment?

Ladies and Gentlemen, I have been tasked to write up a search that would give a total usage for each search from all the different apps. I have been digging through the master/deployment head and I have not found anything to work with. Should I be working directly with the search head where all the apps are running? If anyone could help with a good starting point I would be very grateful. Thanks in advance, Ernie,