How to access User's Time Zone if no access to USR02

Hi,

I have requirement to change User's Default Time zone but only for those who has blank entry and other will remain as it is.

I can do mass update via SU10 however to get list of user's with Blank Time zone i should have access to USR02

as per our security policy no one in organization has access to USR02 table including basis /security team.

how do i get this list in Production system?

Regards,

Satyajit