Staying in USA after Project & petition expiry

[IamSuren]

Hi, Here is my situation 

I’ve approved i-140, my petition is expiring on 3/29 and i-94 on 4/8 meanwhile my project is also completing on 3/29.
My extension is already in progress on the bases of approved i-140 and going to convert in premium in next couple of days.

So my question is that after project completion how many more days , I can stay in USA.
Please advice.

 

Thanks!

[pontevecchio]

Based on a timely filed extension, you are able to stay for 240 days.