Some will disagree with the texture in their mouths if eaten fresh but assuming the plant was watered enough to not cause this prematurely, this is when they are at the peak of flavor, probably the tastiest peppers you will get off that plant. Examine the area immediately around the stem, they usually rot from over-ripening there first and if there is any rot there I just cut that section off and cook the rest. Rot will look not just wrinkly but sunken areas. After the top rots it tends to travel down the placenta before the sides, and will darken it in color, take on a brownish hue.