First, please ensure that 24Q filing is switched on in your Settings. Without 24Q filing, Opfin cannot generate Form 16s.
Form 16s are generated from an organization's Q4 TDS filing. The Q4 filing is usually completed in the month of May (the last date for Q4 filing is 31 May), and post this Form 16s are generated and uploaded for your employees in the month of June. Opfin will automatically notify your employees when their Form 16s are uploaded.