FreePBX Release History

Hello community!
I’m relatively new to the IT community and brand new to the FreePBX forums. I’m trying to find info on the frequency of updates to the distros et al. Something as simple as release history would be great but any information on release schedules, what drives a minor / major release, etc. would be helpful as well.

Of course if there’s a better place to ask, or if there are better ~questions~ to ask any advice is welcome.
I’ve tried searching the forums and the web and the thing that comes closest to what I’m looking for seems to be the download list for older versions of the distros.
Would the “Last modified” field be a reliable indicator of release dates?

Thank you,