This is actually a great sign! Condy's are not supposed to be white actually,
That is a sign of stress. The brown is its symbiotic algae that produces its energy via photosynthesis just like corals. When they are stressed they expel the algae and become white, often leading to a slow demise. Yours however is doing great (unless by brown you mean dried up like a bee jerky).
You may also notice the tips of its tentacles developing a deeper color. This is another good sign.
Now...keep in mind this is one of the least safe anemone in the trade. They have no natural hosting to clown fish, so they can eat one without warning. They are also very mobile. I had one that would climb to the peak of my rock work and literally dislodge itself into the current and onto fish!! I quickly learned these anemones are best kept by themselves. Some are lucky and some arent. Just a heads up! Great work with getting that Condy back to health!
Just feed it a silverside or shrimp a couple or less times a week. Soon you will have a 3 foot beast of an anemone!