After I-485, are these true?

luckyandcurious

Registered Users (C)
my I-485 has been approved.

Do I need to inform my employer to update I-9 (Tax estimate) form, how much important is this?

People say stay with company for at least 6 months, how much it is true?

Is it OK to goto ASC for Passport stamping though USCIS says "don't take any action" in the approval notice ?
 
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