Shopper Approved sends daily feeds of the reviews we collect to Google. However, the reviews will need to pass Google's algorithm for a valid review and Google must update on their end for your reviews to start displaying.
Google updates about once a month - sometimes more, sometimes less. A good guideline is 4-6 weeks from when you collect the review to see it on Google.
A good way to track your reviews is to access your Google Merchant Seller Rating Page. You can see this here: