When I can file tax return for AY-20-21 under section 44ADA

Hi

I files my tax under 44ADA

Usually the last date is 15 March for the same ( advance tax) without any penalties.

Could anyone please let me know by when I can file the tax return for FY-19-20 (AY-20-21)

The issue is when I try to e-file my return on portal the drop-down menu don't have AY-20-21 to select from. May be below image would clear the query a bit more..

Please help?