I remember that
my receipt notices for 485 applications came sooner than the receipt notices for AP and EAD. My attorney recieved the I-485 receipt notices in about 2 weeks of filing and I received the receipt notices directly for AP and EAD in about the same time.
Interestingly, I never received the receipt notices for my spouse's EAD and the receipt notices for the APs for both my daughter and spouse. However, we contacted BCIS (then INS) and obtained the LIN numbers from the IIO. The EAD and APs were approved (see all dates below)
Trust this helps.