Black Friday is for consumer goods. High end lenses aren't likely to be discounted.
You can register on CanonPriceWatch.com and to be notified if the price drops below a target level you set.
Honestly, right now the lens is pretty much at an historic low. The new price is only $100 over the refurbished price from Canon. Canon refurbished periodically offers a discount, so there is an outside chance you could save a little more if that happens, but this lens tends to sell out immediately on refurbished, so you have to act fast and it may not be available at the time they offer a discount. I'm a big fan of refurbished, but honestly for $100 I'd rather buy new.
There is also a chance that Adorama or B&H may put this lens up on a one-day "can't show price" sale at some point between now and Christmas, but I would be very surprised if it drops much below the current $2,100 price.
Welcome to the U.S. BTW.