Can't seem to find a Menu Bar Dictionary

Did you look in the App Store under "dictionary"?

I keep the Dictionary application that ships with macOS in the Dock about mid-screen for the least amount of mouse movement to click on it. You can also use a trackpad three-finger tap (must be configured in trackpad preference), or simply hover the pointer over a word you want to look up and press control+command+d to perform the lookup in place.

You can even use the Safari browser to open the Apple dictionary application to a chosen word by entering the following in the address field:

dict://word

Safari will open a panel requesting permission to allow it to open the Dictionary application. Click Allow. and then the definition of word would be shown.