Is it correct that I cannot e-file Georgia Partnership until 3/8/24?

Georgia Partnership Form Availability says e-file 03/08/2024. Is it correct that I cannot e-file Georgia Partnership until 03/08/24?

 

ALSO, what does it mean that form 8453P is unsupported? Does this mean I e-file all forms on 3/8/24 and mail this one?