Was pretty straightforward. Flew in to Toronto, at the first immigration desk they check your visa, customs declaration form and send you on to another section for the work permit. I was asked for the letter of approval, employer offer letter, quarantine plan and provided with the work permit 5-10 mins later. For customs, I had a goods to follow list ready for stamping but the officer told me that it only applies to PR holders (and possibly work permits longer than 36 months). Took an airport taxi and checked into an AirBnB after that.
Haven't fully solved for the SIN & bank account yet. There is going to be a total lockdown in ON after boxing day (26th). Also, there is some discussion around the 14 day quarantine getting replaced with a COVID test on arrival in YYZ and a 2-day quarantine (if negative). Something to look into for people who are planning their travel in the coming weeks. Hope this helps.