I think it tells you right up on the yellow bar at the top of the form, but looks like end of March.

Agreed, the posted date is 3/25.

it does for e-file (This form is not EF ready) EF ready on 3/25/2021

so I guess that is for mailing also

Thanks 

You wont be able to print and mail or Efile it until the 25th of March.

Thank You

You're correct and thanks

Gotta' be that way