I was poking around in my plugins folder and found a couple of things from 2013. One was Unminimize All Windows (of front application). It appears that I got it from Peter. Here’s the AppleScript text. Guess changing false to true would give me a script to minimize all windows of the front application.
tell application (path to frontmost application as text)
try
using terms from application "Mail"
set miniaturized of windows to false -- most apps
end using terms from
end try
try
using terms from application "Finder"
set collapsed of windows to false -- Finder
end using terms from
end try
end tell
If you want to leave the frontmost window unminiimized, just use rest of windows