OPT Extension (USCIS received on 08/03/2016)

OPT-Extension: YSC1690147XXX

USCIS Received on 08/03/2016

昨天我在网上submit an inquiry，今天早晨收到邮件是已经Approved，送去制卡了，但是网上状态还是Case was received.

邮件里面的话是这样的：
Our service records indicate that we recently approved your Form I-765 and sent it to card production. If you do not receive the Employment Authorization Document within 30 days please contact us again.

这个还需要多久才能邮寄出来，希望知情的童鞋帮忙答复一下，非常感谢。