My son reached out to several d1 juco programs in mid summer before his senior year. Sent an intro email with video and metrics. One immediately called saying they were going to be needing his position. After that son would update them, but never really got much response other than one word replies. Come October, they offered a full scholarship without ever seeing him play in person and were ready to send him the paperwork to sign in Nov. He asked to visit and meet in person first, but he ended up signing soon after. My son did reach out to other d1/d2 juco programs in the late summer/early fall and some of those jucos responded that they had already finished recruiting. He had reached out to the nearest D1 juco program during his HS junior year, but never heard anything.
Son used College Baseball Insights to help determine which programs have a good history of placing players into D1 programs. I think it's very useful to be evaluated though, so you don't waste your time aiming too high as there are many jucos that have developmental programs and playing time is competitive.