Yes, you can certainly use those expressions to convey that the pianist's moment of success and recognition is approaching. However, I would suggest a slight modification to the wording to make it more appropriate for the situation. Here are alternative ways to express the same idea: "Her time to shine is coming up." "She is about to enter her prime and make her mark in the music world." "Her era of greatness is just beginning." These alternatives maintain the essence of the original expressions while sounding more natural and appropriate for the context of a talented pianist preparing for her first concert.