Changing job immediately after I-140 is approved

[NerverOfSteel]

Hi,

I very recently got my I-140 approved a couple of days back. My GC is filed in EB-2 Category. Also i will be soon completing 6 years on my H1-B visa.
Q1. Can can i change my Job/Employer now or should i wait for 180 days after approval of I-140 to change my Job
Q2. Also if i plan to bring my wife to H4-EAD , should i have to wait for 180 days so that I-140 cannot be revoked.

Thanks