You when you have finished writing that report

Do you not realize that there are an infinite number of possible, acceptable responses??

Here are just a few off the top of my head.

You can eat the cookie when you have finished writing that report.

You will be promoted to office manager when you have finished writing that report.

You get to leave early when you have finished writing that report.

Explanation:

your answer would be a verb. because they are "doing something"

you do this because a real teammate puts the team first