After you file

I filed the federal only from Turbo tax, it went though.  Then I thought I could file state only on taxact, but it won't let me file state only.  If i continue to file with fed return tax, will I be able to file state tax only?  Will fed state return reject me?  Can I file state only ?

 

Also, some sites say it only accepts e-file, is it true although I do see paper filing....

 

by the way, at this point of time - coronavirus, almost every one is staying home or working from home, if I mail it out, will it be processed since no one will go in the office???