Options when GC process is started but may not be completed before max out

[kaps2kool]

My employer has begun my green card process but it is in initial stage i.e. recruitment/advertisement has to be started. My max out date including recaptured time I spent outside US is end of May-2018. By then I doubt my PERM and I-140 will be approved. I wanted to know what are the options I have?
1. If my PERM doesn't get approved by May-2018 and I've to leave US, will the PERM continue while I'm out and can I apply for I-140 while still being out?
2. If my PERM gets approved but I-140 doesn't get approved by May-2018:
 a. Can I still apply for 7th year extension using my PERM?  (Note: May-2018 date is after recapturing the time I have spent outside US.)
 b. If I can't get 7th year extension using my PERM or if that is not an option and I have to leave US, then will my I-140 still continue processing and I can apply for H1B again under cap exempt once I-140 is approved and enter US?
3. In any way will it benefit to go out of US for sometime say March month and stay out until my PERM & I-140 is approved and then reenter so that I don't exhaust my max out?
4. Any other option/suggestion through which I can continue my stay and work in US?

 

Appreciate any help/suggestion.

[Pamy]

Am in pretty much same situation. In addition to the above, I would like to know whether I can leave my wife and kids here in US and I alone move out and come back once my perm is approved.

Thanks!