For information on the available MongoDB operations, see https://www.mongodb.com/docs/v4.4 in the MongoDB documentation.
The MongoDB console includes a link to download an audit report of Mongo queries initiated from the page.
Columns in the PDF report include "performer" (the user who ran the query) and "action date & time" (timestamp of when the query was run).
Navigate to Admin > Advanced > MongoDB.
Click Download Audit Log.