Follow these steps to help you find the total number of installs for each of your apps. Note: you will need a finance, sales, or admin role to access app analytics.
Go to https://itunesconnect.apple.com and sign in to your Apple developer account. Click “app analytics”.
Use the “app units” report to see how many times your app has been installed. You’re able to select a custom date range at the top of the page. Click on the “app units” report to get more detail.
Here is a link with videos providing more information on Apple metrics.