H1 b extension in progress, got second RFE, I94 expired and 240 days completed.

[MadhuC421]

Hi,

My employer has filed for my H1 extension in July 2017 before my I94 was expired. I've got 2nd RFE before 240 days rule applies. My employer has not responded to my 2nd RFE yet (240 days completed). USCIS has given time to respond for RFE. Is my stay in USA valid as my I94 has already expired?

Appreciate your help.

Thank you...