Does anyone know when Season 4 will become available to buy on Prime Video?

I can't afford a continuing subscription to MGM+. When I used the free trial, I found From. I have been able to buy seasons 1-3 on my prime video account, which my mom pays for.

I am DYING to know what happens with Julie. No spoilers please!

I was just wondering if I had to wait until the end of the year or next year. Thanks!