If your metro is like ours, you'll be off the clock by 10pm at the latest. Make sure you work every preload shift offered. You will be available to drive if needed, just make sure you have your browns with you everyday. Our contract has a supplement that allows you to not work, if you choose. There is nothing about allowing you to work. Whatever sort you were originally hired for is your sort and your right to work it as you have seniority over others, I assume.