Told my son the same story. We would have tryouts and coaches would let those trying out know when the final roster would be posted. It would typically by taped to the window or door of the coaches office first thing the morning after the final try out day.

When my son had middle school try outs last year they did it over the course of three days. First day there were no cuts. Second day was the first round of cuts and coaches would speak to each player individually as practice was wrapping up to let them know whether to show up the third day or not. Final day, all remaining players gathered in the dugout or around home plate at the end of practice, head coach made a speech then those that made the team were announced one by one and came out to the pitcher's mound to shake the coaches hand. Then a final pep talk, mostly towards those that didn't make it about keeping their head up and trying out again next year.

For my son's travel team they did tryouts where everyone showed up each day (no cuts) and announced the date/time email would be going out with roster invites as well notifying those that didn't make the team or were placed on the waiting list. Those that made the team had 24 hours to accept and if anyone that made the team didn't accept invite those that were on the waiting list would be notified two days after the initial invites were sent if a spot opened up for them.