See AIC
http://www.airservicesaustralia.com/...up/a12-h31.pdf
During these two minutes, the light level will probably be equivalent to a late twilight and the horizon may be lost from sight. As the light level will drop rapidly, it will take time for eyes to adapt to the change.
Operationally, pilots and operators are still obliged to fulfill their obligations in relation to flight within the Visual Meteorological Conditions Rule set.
Sitting on Clifton Beach during total portion of the eclipse, it was dark, no horizon, and to my mind, not VMC.