If you have all parts on and speedo drive too the axle automatically centers on the disc side and you push lower forks together to take out slop on the other side, the axle ends up hitting the step to be correct. Meaning there is no way the wheel CAN'T be centered.
You must back off the center screw in caliper bracket counterclockwise to let the brake caliper be super loose while fitting the wheel or it will interfere with the work. Once axle is tight then you get somebody to sit on bike on centerstand to lift front wheel clear of the ground and slow screw the caliper bracket bolt (slot head screw to identify it) back clockwise while turning the wheel until the wheel begins to drag and then back off the screw a 1/4 turn to hust loosen it back up and done. The brake caliper MUST be adjusted after installing the front wheel as you have to mess it up to get the wheel in easily and correctly.