When will the rich snippets display on Google Search Result?

After your product starts to have reviews, you should be able to see the rich snippets display after 2 weeks.

For example:

Rating stars displayed on Google Search Result
Rating stars displayed on Google Shopping Ads

Right after the installation, the app submits the review and star rating to Google. Google will then crawl and display the star ratings snippet on SERP (Search Engine Result Page). That’s why our app can’t control when the snippet is enabled. 2 weeks should be enough time for crawling and enabling snippets.