I want to add on top of that, that's no matter when or if the mod if finished, what matters the most is what you already have done. It seems like you've also improved a lot as an artist since you started, and that's what's the most valuable, I believe.
You've done a great job at improving, and shared your work for everyone to see for free.
Even if you hear many loud voices complain about how "slow" you are, you should remember that many people will keep supporting you regardless of your speed!
We came here to add some spice to our nightly sessions, but by now, we're here because we love the value you added to the game, a great game that is always better by each replay seeing even more colors!
Nobody is perfect, and what you've given is already worth way more than what those who complain will ever give to others.
For all these reasons you should be proud of yourself!
Keep on improving, and deliver at your own pace! If anything, it would be bad if coloring became a chore for you.
I and many others will still be here whenever you hit a new threshold, no matter when it will be, and no matter how much AI stand in your way, your work has your soul put into it, which is personally what interest me in art, not stolen or randomly generated assets.