How long after the AGR selection board will status change on HRC?

It really just depends. You could see it update within a few days or a few weeks. It will update eventually though. Just be patient. It can be a painful process.

It’s first come first served, your application goes on the stack, they call everyone on the stack and slot the first person to say yes so based on the amount of positions available for your MOS and the amount of applicants it can be anywhere from a week to a year (after a year you’ll have to submit another application) good luck but be patient!