With a whole chicken the metric isn't it through the thigh.
Bone in thigh cooks faster. Breast is a great carver but if the thigh is over. The breast in knackered.
Lol. My sister uses a meat thermometer. She plunges it through the breast. When I pointed out she had gone right through to the well-packed citrusy, garlicky stuffing which was boiling, she wasn't happy.