I-485 was updated again to Post Decision from Decison. Why?

I got the welcome notice by mail last Saturday. Today I got the email it was updated to post decision from decision, but not my son's case. What does this mean? I went to infopass to have the stamp last week, yet I was told not ready yet. Does this mean I can go now to have it? How long it takes to get the green card?

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• 回複：I-485 was updated again to Post Decision from Decison. Why?? -863211- ♂ (466 bytes) () 06/28/2010 postreply 17:41:25

• 回複：thanks. another question -mousegirl09- ♀ (443 bytes) () 06/28/2010 postreply 18:22:46

• 回複：回複：thanks. another question -863211- ♂ (608 bytes) () 06/28/2010 postreply 18:27:16

• 回複：crispy clear, thanks -mousegirl09- ♀ (172 bytes) () 06/28/2010 postreply 19:15:17

• Can I visit a local office out of state? There is nothing availa -mousegirl09- ♀ (0 bytes) () 06/28/2010 postreply 19:32:01

• Yes. -863211- ♂ (0 bytes) () 06/28/2010 postreply 19:39:34