Likely less than 100 cfs ... Likely way too low to boat. (Please use "Reports" to help define/refine ranges!)
Most likely very low. Must be confirmed by visual inspection.
The Wing Man Wave can be seen easily as you approach it, due to the river being constricted down to about 1/3 it's width by a large bank of rock on river left, which creates the contriction for the wave.
The easiest way to catch this wave is to hit the eddy just above the wave (about 15-20 foot) on river right, then peel out paddling upstream to easily catch the foam pile and surf until your content. At best surf levels, this wave has a great foam pile but may be a touch flushy in the center, with great surfing troughs on either side (probably 30' wide, split into to 15' wide waves to either side). Boaters can let others solo surf first, or drop in to share the wave between 2 or 3 boaters, but you may get pushed out or not be able to do any fun moves with more than 2 boaters (you and your wing man).
The wave is best at medium to lower flows, and washes out at higher flows. At best surf levels, reattainment can be difficult. A rock (affectionately known as "Cock-Block Rock" by the locals) blocks you from downstream on river left, and river right is all rocky bluff with swift flows. If you want repeat surfing, you will need to carry up the river-left sand/stone bank to put in above the wave.