Every item in the UI should provide info when hovered, and the option to change the response time (milliseconds) or disable completely.
Particularly in an Alpha build where nothing is set in stone and mechanics/systems will be changing constantly. And not just in game related context info but also your dev builds in general, providing info for the actual alpha build itself, it’ll reduce bug reporting when people know what to expect from options and whether mechanic are in a state ready for comment (include dev milestone stage for context element would be clever).
Generally speaking an important factor of hover info is that it prevents UI “accidents of curiosity”; when clicking something you can actually activate it’s context event on first click depending on the current depth of the UI state and context, this means in some cases if info isn’t displayed on hover a player may click something to see what information pops out, the result is a potentially unwanted action being executed.