The easiest place that I've found to see the AMT amount in TurboTax is through the Summary Bar on the left of the screen (select 'Summary' in the Turbotax ribbon). And there you will find a button for the Detailed Tax summary. That sheet includes the "minimum tax" for your return which I believe is the AMT amount.
I'm sure there are other ways to get to the Detailed Tax Summary but that seems like the easiest way.
