什么意思?绿卡?

I am checking my I485 online status, and I got


Application Type: I485, APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS

Current Status: Card Mailed

On November 8, 2007, we mailed the new card directly to the address we have on file. You should receive your new card within 30 days. If you do not, or if you move before you get it, call customer service.


I checked my status several month ago, so I guess I miss several updates, Please tell me what does this mean?