If your child also wants to compete in college, make sure you know the NCAA eligibility rules. If student does graduate early and starts taking college classes, the eligibility clock starts running (usually 5 years to play 4 seasons). If student doesn’t take classes, then the clock is paused.
You might also want to work with the current school to set up how to get letters of recommendation, GC reports, etc. if the child does take a gap year or two, take ACT/SAT tests as a junior, just get everything lined up. May not need them, but best to have them lined up.