请问8老师

我是EB3, final action date has been current since June, but my case(I- 485) is still pending, saying" We are temporarily pausing work on your application because an immigrant visa number is not immediately available to you. Once an immigrant visa number becomes immediately available to you, we will resume processing of your application." 不知道还要等多久才能拿到绿卡？谢谢先！