Is it standard in Ontario not to have exit tabs on new signs, especially when it's an exit only like this:
Ontario typically only puts the exit tab on the advance guide signage; the signs at the actual exit typically do not have tabs.
Yep, Ontario usually only posts exit tabs on advanced signs but I've seen some advanced signs that were also missing exit tabs too. Ontario also didn't post exit tabs even on advanced signs when the BGS was mounted on a cantilever structure until recently when they started cramming it on the upper right corner of the BGS:

I've only seen a few exit signs in Ontario that had tabs but they were usually ones that didn't have a advanced sign because the ramp was too close to another interchange.
I like seeing exit tabs being placed on exit signage but I also remember reading that apparently most drivers in Ontario don't know what the exit tab means of something like that so I guess that's why MTO dosen't bother putting up exit tabs on exit signage.
Here's a couple of pics showing some new lane markings on Highway 401 to better notify drivers that they're in a exit only lane and to make changing lanes right before the gore illegal:
New arrows on the pavement to mark the exit only lane and the optional lane:

New lane striping with a solid white line on the right and a dashed line on the left to only allow drivers to enter the exit only lane but not exit at the last moment: