Roaring Kitty will profit if GameStop's price is above $21 per share in 18 days, as he can exercise contracts to buy at $21.
"exactly 18 days from now if GameStop's price is more than $21 a share he'll end up making a lot of money because at that point he able to exercise his contracts and buy GameStop at $21 a share regardless of how much higher GameStop's price might be"