When do Pre-order analytics become available?

My app was recently approved and I have been trying to watch metrics so I an adjust my marketing campaign. When I go to the Apple Developer analytics dashboard there isn't anything there and its been almost a week since releasing my pre-order. The only message I see is "Not enough Data: Data is displayed when a certain number of data points become available."

When will this data become available and how many data points are needed until I can begin tracking? On the Google Play Console I was able to see when I had as little as 2 pre-registered users.

When do Pre-order analytics become available?
 
 
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