Use it to describe winning, especially when many are trying hard to succeed. In the end, she came out on top after all the rounds of interviews.
Pro Tip 2/3
Figurative Use
It's often used figuratively to mean overcoming obstacles, not just literal competitions. Even after the setbacks, he came out on top with his innovative idea.
Pro Tip 3/3
Positive Outcome
Implies a successful outcome after a series of events or processes. Despite the market crash, the savvy investor came out on top.