Baseline: time it before you change it
You cannot say it saved time unless you timed the old way.
A baseline is how long a job takes, and how good the result is, before you change anything. Time the old way and the new way, with your checking included in the "after". Decide what "as good as before" means before you start, so speed cannot be counted as success when quality slipped.
A weekly report that took 90 minutes and now takes 25 saves 65 minutes a week, about 54 hours a year at 50 weeks. If it took 90 and now takes 80 because you correct the output, this task is not one AI helps with. Drop it.
Find your way around
Learn it in the course, copy it from a playbook, see it work in a case study.