Do you not expect more? I hope he cuts more than that, although cutting Mt Fuji wouldn't be bad.
Well, considering it's size, idk if we can expect any better DC feat in Wano than that...
Maybe destroying the outer wall of the pool which is Wano which would bring the ocean level down to the rest of waters outside but that would ruin the natural defences of the country so probably wont happen and they should be too far away from it.
Even Mt Fuji to be destroyed, from the capital, is kinda a stretch but if it happens, sugoi.
If all the destruction remains contained within Onigashima, the best we can hope for is the giant skull to crumble...