This is optional, but it really brings out the flavors, and helps keep the chicken really tender and juicy!  I will brine 1-2 days in advance, and it is significantly tender when cooking the chicken. If you forget day of; do it in the morning to cook at night for dinner, any brining with help! But, again, if you're in a pinch, or don't want to brine, it's totally fine and this will be just as delicious!