Case Approved

I485 approved with out interviews
i am very confused and surprised after a year of struggled with any update on 485 or i 130.Today just got notification that my I485 has been approved and they will mail me a card . My question is that :why there’s no interview conducted? what will be the next steps? should i talk to uscis agent about the interview waived? FO: Sacramento,CA PD: 05-19-21
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