Updated Timeline:
App Received - Sept 1st 2017
AOR - October 31st 2017
Schedule A - November 10th 2017
Medical Request - March 21st 2018
Medical Passed - April 10th 2018
Background Check is in progress
Ecas is now showing in process for both Sponsor and PA.
I also received a phonecall from IRCC this morning and was told my work permit has now been authorized and will be issued today! And that I should get it in the mail within 5 business days! (I applied whilst out of status but left for a short trip to the UK and re entered Canada) Happy days!