Greened? See NSC email insde. Why online status didn't change?

Greened? See below email from NSC. Why online status didn't change? Is this normal? I thought online staus and text message are the fastest notice.

Keep fingers cross。

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Subject: Re: (KRT 13235) Pending I485: WACXXXXXX

Good morning,

Our service records show your application was approved on 08/16/10. Request has been sent for card production.

Thank you,

USCIS NEBRASKA SERVICE CENTER/ EX0210