How do you evaluate if your kid is on track?

My husband and I are considering homeschooling my oldest this upcoming fall who would be in 1st grade. At this point, we would plan on sending him back to school sometime in middle school or high school. Making sure he is on track with learning standards feels important to my husband and I. As we move about our merry way homeschooling next year, following the curriculum we’ve chosen, how do we know that he’s learning what a first grader should learn? What standards do you all follow to know if your kid is on track academically? Thanks for your time!