Purchases.shared.getCustomerInfo too slow.

Users have reported and proved active subscriptions. Only they are presented with the paywall. 

here is my code to check their status 

static func isPremiumSubscriber() -> Bool {

var subscribed = false

 Purchases.shared.getCustomerInfo { customerInfo, error in


//this is too slow as subscribed is not updated to the result of 

//!customerInfo!.entitlements.active.isEmpty

//before function is returned with the initial value of false for subscribed.



     subscribed = !customerInfo!.entitlements.active.isEmpty 


}

return subscribed 
}