Unfortunately, this isn't possible. You can either print off your slide notes and use that or have PPT up on a second monitor so you can see the slide notes there.
But we should look at the monitor that has the webcam and is displaying the slide. Looking at somewhere else will make the recorded video unprofessional.
Hope that in the next version of Presenter, we could "Record video for each slide and have the option to display the note (script) of the slide being recorded (Similar to audio recording)".