还要等多长时间才能拿到EAD？

上周二，打电话要求加速EAD。今天刚收到USCIS发的e-mail. 内容如下。 好象是EAD加速办理被批准了（等了也近三个月了）。请问还需要再等多少天能才收到EAD？急死我了。
The status of this service request is:

Documentation submitted meets the requirements for expedite processing of your application/petition. The average time for a decision or correspondence is within two to three weeks, although the process is often faster.