The post-application phase looks something like this :
Submission -> AOR (~ 3 months)
AOR -> IP (~ 2 months)
--> Some might receive
additional documents request here
--> Some might receive Fingerprint request here
IP -> Online Test (Unknown for 2020 applicants, will take a long time)
--> Some applicants might be asked to attend an interview here
Online Test -> DM (For some, takes a few days, others weeks)
DM -> Oath (Again, greatly varies based on location and other factors)
This is the process but the timeline between the the steps greatly varies based on so many factors. You might want to check the 2019 and 2020 tracker in my signature if you want to see how the timelines are playing out.