Got mine 4 days after my approval message. Approved Monday, received it on that Friday. That tracking number was only useful for telling me what day to expect it, it was like it got produced in Kentucky Tuesday, and then magically was delivered to California on Friday.
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Application Status: APPROVED! (California Service Center)
Application Sent: 01/05/2013 (Phx, AZ) Delivered: 01/07/2013
App Recieved: 01/11/2013 I-797C: 01/13/2013 Biometrics Walk-in: 2/4/2013
Approval: 3/4/13 (52 Days) EAD: Recieved 3/7/13