Yes especially on a high seating vehicle like Toyota Fortuner it helps to see where exactly your front left tyre is and also the front portion of the vehicle. It helps especially when parking and not really when overtaking other vehicle.
The fender mirror helps to spot the distance from sides and front of the vehicle from the kerb or footpath while at parking speeds.Sometimes even some 2 wheeler riders who carelessly put their feet close to your tires in the signal can be spotted with these .The fender mirror works in daylight or in well lit areas only .
Some people actually confuse fender mirrors with Side rear view mirrors.
The actual purpose of fender mirror is mainly for Big SUV's ion which you cant see left portion clearly.
It tells you where you left tyre approximately is.