Macos – How to open folder without using mouse in Mac

Control-F7 is a toggle that will "Change the way Tab moves focus" -- either between text boxes and lists only, or all controls. You want the latter.

Note that with some keyboards that put other functions on the F-keys -- I have Rewind -- you also have to press fn; so fn-Control-F7 should let you Tab to those popups. Space to open the popup, arrow to the selection and Return.

One solution -- Type search phrase into task bar and arrow down to the appropriate entry. Then press the (context) menu key, and "i" for the "Open file location" entry. This isn't as good as a shortcut, but may be as good as it gets.