Re: Impression share for Product Listing Ads?
The AdWords tab in Merchant Center will display campaign details once your Product Listing Ads campaign is set up. You will be able to see basic information about the settings, status, and performance of your Product Listing Ads campaign that you created in Merchant Center.
For more advanced customization and reporting, as well as to view campaigns you created directly in your AdWords account, you can go to AdWords by following the link in your Merchant Center account.
You can then add the impression column to see your impressions.