H1+H4+EAD extension -No receipt

Hi all,
My H1 extension was filed with H4 and EAD on 20th of August.I am yet to receive any receipt notice for myself and any of my dependent.When i contacted lockbox,they said it’s been received and being processed.After few days,i called USCIS,agent said we don’t have any details about you.Anyone have been in this situation.What is timeline for receiving receipt notice for regular filing.Can anyone share their recent timeline.Thanks in advance.

Receipt notice typically takes up to 21 days.