No official listing of arrival times posted anywhere on Internet, AFAIK. Another bulletin board reader posted that he has experienced arrival delays into Toronto as much as 6 to 8 hours in the last two years, with his all-time record delay being 22 hours. My own experience in 2014 was a 9 hour arrival delay into Toronto, which missed the last flight of the day back to my home airport. From what I've seen, it is highly desirable to book an overnight stay in Toronto, and plan for a flight the following day to your endpoint.