Thank you Xiaobaitu and others! NIW got approved by NSC!

On June 20, my hu*****and and I both received our I-485 approval emails from NSC. Thank you, xiaobaitu,radiology, and others for all you help with my questions.

Case Details:
NIW
I-140 and I-485 concurrently filed with VSC on 09/22/05;
1st FP Code 3 on 10/14/05, LUD one day after;
both pending cases transferred to NSC on 05/11/06;
I-140 approved on 08/02/06;
2nd FP Code 1 on 02/27/07, no LUD;
I-485 approved on 06/20/07.
No RFE, and I am not sure when our NC were cleared.

Xiaobaitu, may I ask you some additional questions? We only received "Approval Notice Sent" e-mails in stead of "Card Production Ordered". So I wonder how long it will take to deliver the actual cards to us. I heard that I could go to the local office to have my passport stamped with Form I-551 for the travelling purpose before getting the card.

Also, is there any limitations on using green card to work?

Last, do I need to change my Social Security Card immediately after receiving green card? Thank you again for your time and kindness. Good luck to everyone here!!!