Wind turbine are generally far less then 50% efficient at turning the kinetic energy of wind into mechanical energy, most are under 40%. The theoretical maximum is about 59%.

Losses from the transmission and generator are 10-20%.

Losses from power transmission and conditioning would be another 5-10%.

Losses at the electric motor would 3-5%.

The loss of most boat props is between 20-40%.

Then there’s the issue of forces on the ship caused by a wind turbine, by design would be working AGAINST the motion of the ship with anything except a tail wind.

So yeah, it would be totally useless.