Hello,
I am very familiar with this process as I am ABFM boarded and just got my Ontario license so I can give you a definitive answer. The answer depends on how you want to start practicing:
1) To obtain an independent license (ie. practice immediately anywhere you want without a preceptor): You need to write QE1 and QE2 full stop. You do not need to write the Canadian family med exam if you have completed ABFM as they are equivalent, however writing the Canadian exam will speed up the process by about 2 months. If you can continue working in the states, then do that in the meantime. If you will be in Canada, an extra two months of sitting around is a lot of lost income.
2) To obtain a license through pathway-4 (ie. with a preceptor): You can directly apply with no additional exams. You will need to be precepted for a year, meaning you need to find a job that offers a preceptor (you can filter HFO jobs to see only ones with a preceptor). This also affects your income for the year as your preceptor gets some or most of your billings. At the end of the year, you need to undergo an in person/in clinic evaluation with the MCC; not a formal exam, but something like a representative coming to watch you in clinic.
Your go to resources will be Health Force Ontario for questions on the transition, College of Family Physicians of Canada to get your FM training recognized and College of Physicians and Surgeons of Ontario to get your Ontario license.
Let me know if you have additional questions, I'm happy to help.