My experience

I just received AP from CSC.
First, I saw a status saying my case has been approved, a notice has been mailed out, if 14 days ...

Then after three days, the status changed to "The document we made based on the approval or registration of this case has been send to whom ...."

Then three days later, I received the AP, which is the document for travel. I don't think there is I797 approve notice for AP