It depends.
If you have filed your returns and are waiting to see if they have been accepted, please see the links below for instructions on checking your e-file status.
Checking E-File status
State E-file pending
As for the stimulus payments, if the IRS receives and processes your 2019 tax return before they process your stimulus payment, your stimulus payment will be based off of your 2019 return.
If they process it based upon your 2018 return, then your stimulus payment will be processed based upon that return.