Actually, that won't work, the info about autosize no longer appears at the bottom of the output in v8.0.1P3. I can't speak for the other ONTAP v8 versions but I suspect that it is true for them also.
Using powershell seems to be the only way that I can find to do this. Which really seems strange that it can't be done CLI, Systems Manager, DFM, FilerView or any of the other 'common' NetApp adminsitration methods.
The Powershell applet is 'Get-NaVolAutosize'
Paul W.