my shift was from 3 a.m. to 9 a.m., my day started very early but my job was seasonal so the time i spent there was an experience. Especially during the holidays the work is hectic and you have to work very fast to get the trucks ready for there morning route.
You don't receive any benefits until you've completed your first year at UPS. If you can handle the fast paced environment, then I strongly suggest you apply. Make sure you join the union. You won't receive vacation or sick days until you complete your first year.