So now, I finally managed to update the map of my route. I struggled a bit with the limitation to 10 layers on the free Google Maps version. However, I found a way which should work for this trip.
And here it is even embedded into a blog post. If you click the small rectangle symbol in the upper right corner, it will open in a separate tab or window.
You can even find this map now at any time in the left main menu below Traveling – Canada 2018 – Route Map.