Show up, do your work, go home.
Show up on time, do your best work, go home feeling accomplished.
Show up on time so you can focus without early distractions (like email, or the mess from yesterday), do your best work because the world needs it and your company enables it, go home feeling accomplished because you did something that moved you towards the change you seek to make.
Amateurs do the work because they have to. Professionals do the work because it’s important and the world would suffer if they didn’t.