Raj, a question to you, from your GCMS and e-tracker could you tell me when your file moved to local office, when your criminality and security passed and what date it appeared on e-tracker?"What will happen next" is explained in this post. This is the general workflow seen nowadays for Citizenship grant applications.
However... "How long is to going to take..." is a tricky question. Honestly, nobody can tell you that. Some late 2020 applicants have completed their test invite and their interview while some 2019 applicants are still waiting. We simply don't know, depends on your local visa office and the officer processing your file. However, a ball park estimate for citizenship tests as far as August 2020 applicants might be in the next 2 months IMO. Again, that is only my opinion, I am not sure.
Just wanting to establish a timeline!