H4 Visa And EAD both expiring

Hello,

Both of my H4 visa and EAD are valid until May 2021.

Question :

Can I file my application online?

Do I need to file an extension for H4 visa with the new biometrics rule?

Can I file H4 extension and EAD concurrently?

Is there any reference topic on the website that I can follow for my situation?

Thanks,