Jimmy2621 and others who are still waiting, an update for the 2017's
Three friends (2 from QLD and 1 in NSW) applied for citizenship on 6 June 2017.
QLD friend #1 timeline:
Application online : 6 June 2017
Acknowledgement by email : 6 June 2017
Request for additional documents: 6 November 2017
Citizenship Appointment Letter Received : 23 November 2017
Citizenship Interview & Test Date : 6 December 2017
Citizenship Approved: 27 February 2018
Ceremony: 16 May 2018
QLD friend #2 timeline: same but without a request for extra documents (approved in Feb 2018)
NSW friend #3
Application online : 6 June 2017
Acknowledgement by email : 6 June 2017
Citizenship Interview & Test Date : 4 July 2018 (yes, 13 months after applying)
Approved sometime in the last 14 days (March 2019), the status online changed from received to approved. No letter for the ceremony yet, but that can take up to six months. So, from date of applying to approved, a year and eight months.
In the first two cases, the online status never changed from received to approved - after the ceremony, it changed into finalised or something like that, but nothing in between.
But for friend number 3, it did change from received to approved.
All the best to everyone!!!