We have submitted the package on 21st, March.
It was delivered on 23rd. Checks are not cashed yet. Is there any other
way to know which DO? or processing status?
....
Not sure what you mean by "..any other way to know which DO.."?
To locate your DO, go here: https://egov.uscis.gov/crisgwi/go?action=offices.type&OfficeLocator.office_type=LO