Great question — answering as the UphillTech team:
The only way to be sure is to measure the internal temperature of the meat. FoodSafety.gov says that chicken, including the breast, should be cooked to 165 F/74 C to meet food safety guidelines. Searing for a given time and then resting is no indication of whether something is cooked, particularly for something with a widely variable size like chicken breast. The breast in your picture could be anywhere between about 4 oz (113 g) and 8 oz (226 g), and with such size differences, different cooking times are needed to reach the required temperature. We cannot tell from a picture whether this is cooked enough to meet this requirement. Get a meat thermometer to ensure that you have cooked your...
Full answer by bob1: https://cooking.stackexchange.com/a/127963 (CC BY-SA 4.0).
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