Question Regarding H-1B Status and Green Card Process

[Nakul J]

My previous employer initiated my green card process, and my I-140 was approved. I continued working with them for another seven years until I was laid off due to a corporate restructuring during COVID-19 pandemic. I had switched to B-2 status briefly due to the COVID related travel restrictions and returned to my home country shortly after. My priority date became current at one point but it retrogressed again after a few months.

Last year, I returned to the U.S. on an H-1B visa to start a new job. My priority date has become current again, but my new employer has not yet started the green card process. I understand that PERM processing is currently taking more than a year. 

I have a few related questions:

• How long can I continue on my H-1B after my priority date becomes current?
• Is there a stipulated period within which I must complete the green card process after my priority date becomes current?
• Assuming there is no retrogression, if it takes another two years to reach the adjustment of status stage, can I still continue with the GC process and my current employer continue filing H-1b extensions until my GC is approved?

I would greatly appreciate your guidance on these questions.