The Steam notice can tell you if a game that still needs work hasn’t been updated in months or even years.
It’s still not exactly clear what updates are substantial enough to reset the counter and how long it takes between updates ...
Steam has added a new feature to early access games, flagging when they were last updated to let you know exactly what you're getting into.
Valve has a warning label feature towards Early Access Software that has not been updated for quite some time.