State tax filing

Amy, I want to understand what is 5 days from the due date exactly mean. Is the due date mean 4/18/23? Or the date I get rejected? 

Another question is: I have the electronic file date sent by turbotax, isn't it the equivalent of the physical mail? So what does the new technology help us? I paid $25 to turbotax for the convenience of e-file, and it couldn't prove that I filed on time??