Once you've enabled the Optimizely-AT Internet integration and started your experiment, you can view this data in your AT Internet Analytics Suite (Reports App, Dashboards App or Data Query).
Once logged in, click Usability > Multivariate Testing on the left-hand navigation menu at the bottom. You can then select "Tests" to see a list of all the experiments that have sent data to AT Internet, and see their metrics broken down by variation names.