tooth 'shape' is hard to judge on modern chainrings, some have flatten top, others have a sharkfin shape which appears 'worn' but isn't.
way we had checked BITD, with chainline tight on chainring and all the way through jockeywheels and middle cog - pull/lift chainlink off of chainring at the point where a horizontal line bisects the Bottom bracket. This is the point where the chainwrap on the ring is the tightest.
If the chain lifts so much that the chainring teeth are greatly/more than fully exposed - ring may be worn... Total Judgement call !!! I'm not acquainted with any 'hard measure'.


This one looks ok.
IMPORTANT Conidtions
Chain must be in almost new or new condition. Worn chains first thing to check (best with a Park Tools chain checker (there are many poor/cheap substitutes which aren't accurate).
The CC3 and similar from Park Tools are great.
Used Bike? Always check the chain before using...
My visual assessment (which may be wrong) is the chainring looks good.
Ride On
Yuri