Tuition Reimbursement, whats next?

Just got approved for Tuition Reimbursement for the first time for Spring 2019 which will by my last semester. I was told it was only for preloading but I got approved for twilight. I was wondering if anyone has used it before? What I should know that I probably don't know, and if I keep the reimbursement if I decide to become a supervisor. It hasn't been paid out to me and I think it gets paid out once I turn in my grades at the end of the semester which won't be till late May 2019.