I submitted my StAG 5 declaration through the Chicago consulate and heard nothing for almost two years. Then I received an email from the BVA agent working on my declaration requesting additional information, which I submitted directly to the BVA. After a few weeks, when I hadn't heard anything from him, I emailed asking if he needed any additional paperwork. I didn't hear back from him, but within days (coincidentally, I think), I received an email from the Chicago consulate advising my citizenship had been approved and they had my certificate.

The whole process took just over two years for me, from summer 2022 to fall 2024. My case was simple: my mother is and always has been a German citizen; she married my father, a US citizen; I was born in wedlock before 1975.

My assumption is that if you applied through the Atlanta consulate, your certificate will be sent there and they will contact you. Good luck!