Check bulk API export usage

I am getting "500 MB exceeded" error while trying to create a bulk export lead job. Where can I see what is using up the usage quotas?

I looked at the docs, and there is a sentence here: https://developers.marketo.com/rest-api/bulk-extract/ which states: "You can determine the total amount of disk used for a the current day by calling Get Export Lead/Activity/Program Member Jobs."

But I am unable to find that command in the original API or python library( I am using marketorestpython).

I just want to be able to view how the 500 MB limit got used up and by whom, either on Marketo or through the API. Because this error has always showed up for some reason and I am unable to diagnose.