I would pitch it!
It looks like a reasonably amount of fairly clean yeast, and if it was just harvested 48 hours ago it should be ready to go. What size bottle is that? My general preference is to pitch the slurry from a 16 oz jar into a standard gravity 5 gal batch, but I have had good luck using a fresh 8 oz jar as well. My harvested yeast does not look as clean as yours.