大侠们，请教Following-to-join的问题

我的绿卡拿到了，老婆在国内。我今年10月底申请I824，12月初824批了。Approval
notice上有
如下两段话：
The above application has been approved. We have notified the consulate
listed above that the applicant's status has been adjusted to that of a
lawful permanent resident.

This form is not a visa nor may it be used in place of a visa.

我的问题是下一步我和我老婆应该做什么？直接到美国广州领馆签证？

请大侠们指点。

谢谢！