Bony's double, the second of them from the penalty spot in injury-time, took the Welshmen to 36 points, six clear of the bottom three with three games remaining.
Monk said: "He's been great, Bony. Obviously with Michu having an indifferent season with niggly injuries, Bony has stepped up to the plate and you can't complain at someone who gets 20-plus goals in a season in his first season here.
"It's not just that, he's a massive character in our changing room, he works so hard every day, he pushes everyone else. If he doesn't score, he's a strength, he's a presence up front and he can be a handful without scoring goals.
"It's even better when he does add goals to it, so he deserves all the credit. He's been brilliant for us and he can only get better."
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