Impossible to know. Waist width alone is irrelevant in determining whether a board is wide enough or too wide.
What matters is foot size (not boot size) and width of the board at the inserts. After that you can look at overhang.
That makes sense. I measured my bare feet and they are 10.25 inches. Unfortunately I can't measure the board. It is a 2012 Ride Highlife UL in a size 158 regular.