This post has given some idea to me, I would like to share my wife's citizenship timeline here:
Citizenship Application Lodged: 27 July 2021
Test Invitation: waiting
Test Date: waiting
Approval: waiting
Ceremony: waiting
Council: City of Wyndham, VIC
Btw, she lodged application with alternative proof for birth certificate e.g. Passport, Overseas Driver Licence, Proof of Age card, School Record. Meanwhile, preparing application for PCC to shorten the wait time.