Agreed, this delay and unpredictability is so frustrating.
I just saw another Mississauga applicant who seems to be seeing Oath scheduled for June 07 in new tracker tool.
I saw that update in April 2019 thread made by a user (bpjeee) for his wife, and apparently in this case Test date is March 24th - and thats what makes it so unpredictable. I know people who wrote the test in Feb (and are still waiting to see an update on thier case since).
Happy for everyone whose cases are moving along - and I just pray mine moves too