US Immigration from Albania

Hi all, my husband is here on B2. Came 03/01/2020, filed for extension 06/2020, on 01/01/2021 got notice to file more info to support extension due 02/10/2021 ( we will file what they want).

We are gathering everything we need for AOS through RapidVisa; our concern is if he overstays his 1 year limit on his current visa (with or without extension approval). Our case is rather simple, but with all the paperwork and things to be done, we are wondering what to do with the fact that he may become illegal in the few coming weeks. Thanks!