Transfer Drive Ownership of Files G-Suite
Best practice to transfer file ownership to user prior to closing G-Suite account
Click Transfer ownership.
For From user, enter the current owner's email address and select the user from the results.
For To user, enter the new owner's email address and select the user from the results.
Click Transfer Files.
Wait for the transfer to complete. The new owner, the previous owner, and the admin who started the transfer get a confirmation email.
To set your expectations, if you transfer ownership of many files and folders at once, it might take some time to see the changes.
This process might take some time depending on user data.
Supporting article we follow for your reference: https://support.google.com/a/answer/1247799
It will be run thru reports too.
From Apps > Reports > Audit and Investigation > Admin Log Events.