Google helps to find your site or page by showing a small part of that content called the 'snippet'. Rich snippets apply Google's algorithms to highlight structured data embedded in web pages. In other words, Rich Snippets are usual search results with additional data displayed. Review is one of the types.
Below you may see how the search result will be displayed with a rich snippet that shows a review rating:
Having a star rating appear next to your online store in Google search results can be extremely beneficial. Star reviews are eye-catching, helping your store stand out from competitors on the Search Engine Results Page. They provide an important element of social proof for your potential customers, invoking a sense of confidence in the products you sell based on what other customers have said.
Furthermore, star ratings have been found to boost click-through rates, increase organic traffic to your website, and as a result, get more sales.
Growave's Rich Snippets code for product pages should automatically be embedded in your store when Growave is installed and integrated into your store! :)
Usually, it may take Google from a couple of days to a few weeks to crawl your reviews, but once all your reviews are crawled, you can see the results on Google.