Akimuu

I was hoping to get advice and a second opinion. My wife and I are starting the process for her AOS process from F-1 visa to green card but... Her F-1 visa expires in a couple days but she is still maintaining her student status at her school and her i-20 is valid until December. We asked a lawyer online for advice and he says its fine to submit the i-485 after her F-1 expires. Is this true? I am a US citizen and I already submitted my i-130 to be her sponsor. We still want to try to submit her i-485 before her F1 visa expires but wont be able to get the marriage certificate on time. We have the customer copy from getting our marriage license and civil ceremony but no certificate yet. other than the marriage certificate we have all other documents. Should we submit the i-485 with basically the receipt of the marriage license before her F1 expires or is it really ok to apply after her visa expires? Thank you in advance for any help on this. AM