想请教一下H1B Case Was Approved 之后多久能收到I797

大家好，最近我的H1B Appeal通过了，然后USCIS也通过了H1B，现在显示的是：

Case Was ApprovedOn March 19, 2019, we approved your Form I-129, Petition for a Nonimmigrant Worker, Receipt Number xxx. We will mail your approval notice. Please follow the instructions in the notice. If you move, go to 1point3acres.com to give us your new mailing address.

想请教一下之后是要干什么呢？我到现在快两周还没有收到I-797，不知道该怎么办。望大家能指点~