Um, I'm afraid that wasn't too clear on me so just to confirm, you're proposing that the selected hue for a country be red to indicate the progress bar and to have no peripheral selection if something hasn't been completed? If so, it'll be too indistinct and players would be better off checking the land's production manually since you won't know how many turns left, just if something has completed or not.
I'd prefer something more visually distinct like a vertical bar or a circle (so I wouldn't have to confirm the turns):
~Maybe try to invent / use symbols to denote turns??
Something I mentioned on my thread but expanded upon here; add pop-ups to show details such as lands left neglected when attempting to press "End Turn". You can also use pop-ups to show how *MUCH* influence affects the turn duration for production (i.e. some recently "Supportive" lands still take 3 turns to farm), emphasis on details since it should be a optional pop-up based on settings :)