最近给父母的B2办延期，9月14号受到email如下, 但是至今没有收到信，眼见父母半年的归期临近，真是很着急。请最近办父母延期的帮忙看看，这封email,是凶是吉？如果批了，是不是应该写着：An approve notice had been mailed.
Current Status: We mailed you a decision.
On September 14, 2007, we mailed you a decision on your I539, APPLICATION TO EXTEND OR CHANGE NONIMMIGRANT STATUS. Please follow the instructions on the notice. If you move before you receive the notice, please contact customer service.