I think the yellowing at this point is just going to be the natural fade as the plant finishes up. I'd leave them on until they get very dry, brown, and crispy, let the plant pull everything from them first. Molasses needs to be added 2 weeks prior to the finish. It doesn't feed the plant, it feeds the soil biome that in turn produce what the plant wants. You could certainly blend it into your current feed and it won't hurt anything. Just be sure to do it right before you water and don't let it sit around with all that sugar. Also, look for blackstrap unsulphured molasses. Good luck!
Ok. I might just leave the it then.i have some non suffered black strap there but like you said most likely too late.