EB1A approved(Dec 15), applied for I-485, I-765 and I-131 on Nov 29. Want to change job, my options?

Hi,

I have a need to change job due to personal circumstances. I can stay in my current job till June if required, but I would prefer changing job after that. My EB1A petition was sponsored by my company. Now, my question is, what options do I have if I want to still get the green card, assuming that the I-485 petition is NOT approved by June?I obviously cannot risk re-applying for EB1A. I have not received my EAD and AP documents if it matters. What do you think would be the ETA for the same?