The picture below may not show much progress, but that tiny orange marker in the top right of this picture is the end of skein three. Only two more skeins.
I did some calculating. Each skein gives me about fourteen of the reverse stockinette ridges. I plan on thirteen ridges on the last skein, to be sure I can still do the 2 rows of garter stitch and have enough left to cast off. So only 27 more ridges to go!
I can feel the start of my Color Affliction shaw within reach.