Marshmallow 6.0.1 for the Galaxy S5 was released late last night and into the early morning hours for OTA or direct connection download via SmartSwitch.
Personally, I've got it downloading now on my S5! YA!
Thanks for your patience,
the worst advice EVER is 'keep checking rogers os upgrade link'. ...they do NOT update that on a timely fashion.
You're better off just googling 'S5 marshmallow' from time to time to see when a headlines reads that it has been
released in Canada.