You should be able to. I have only been able to see these great birds hunt on just one occasion when I visited Nova Scotia (you lucky Canadians!) and got a similar shot with a 100-400mm II on a 7DII. It was when I also got the shot of the Osprey with the flounder I use as my avatar. Maybe I'll get another chance post-covid to visit.
You definitely can the 100-500 is more then capable as you can see here on this shot of a bluebill even in flat light.