Your bread cubes should feel dry to the touch. If you squeeze one, it should not squish. It should crumble a little, but not turn into dust. Think of a crisp day-old croissant—still good, but not fresh out of the bakery.
If you bite a cube (yes, taste test it), it should be firm but not hard as rock. If it snaps like a cracker, you over-baked it. That’s okay—just add a little more broth to your stuffing recipe. You’re the boss of your stuffing.