softwareupdate --history
Some commands discussed here no longer work https://forums.macrumors.com/threads/how-to-know-mrt-version.2210895/
From Terminali'm always checking "Intallations" in "about this Mac"
Code:
system_profiler SPInstallHistoryDataType | grep -A 4 "MRT*"
system_profiler SPInstallHistoryDataType | grep -A 4 "XProtect*"
Some commands discussed here no longer work https://forums.macrumors.com/threads/how-to-know-mrt-version.2210895/