This can be done using "gen_reports -r acl_usage". You need to have the "auditsql" and "auditdbd" processes running or you won't get any data.
Let us know if you have questions.
There are several posts on this Community about how to use 'cf reports' (gen_reports). There are also then several other posts where I refer people to the former posts about how to use 'cf reports'. Search around here and you'll find what you need.