A google AdMob Reward implementation in SwiftUI

SwiftUI_Ad_Rewarded.swift

import SwiftUI
import GoogleMobileAds
import UIKit
    
final class Rewarded: NSObject, GADRewardedAdDelegate{
    
    var rewardedAd:GADRewardedAd = GADRewardedAd(adUnitID: rewardID)
    
    var rewardFunction: (() -> Void)? = nil
    
    override init() {
        super.init()
        LoadRewarded()
    }
    
    func LoadRewarded(){
        let req = GADRequest()
        self.rewardedAd.load(req)
    }
    
    func showAd(rewardFunction: @escaping () -> Void){
        if self.rewardedAd.isReady{
            self.rewardFunction = rewardFunction
            let root = UIApplication.shared.windows.first?.rootViewController
            self.rewardedAd.present(fromRootViewController: root!, delegate: self)
        }
       else{
           print("Not Ready")
       }
    }
    
    func rewardedAd(_ rewardedAd: GADRewardedAd, userDidEarn reward: GADAdReward) {
        if let rf = rewardFunction {
            rf()
        }
    }
    
    func rewardedAdDidDismiss(_ rewardedAd: GADRewardedAd) {
        self.rewardedAd = GADRewardedAd(adUnitID: rewardID)
        LoadRewarded()
    }
}

struct ContentView:View{
    var rewardAd:Rewarded
    
    init(){
         self.rewardAd = Rewarded()
    }
    
    var body : some View{
      Button(action: {
        self.rewardAd.showAd(rewardFunction: {
          print("Give Reward")
        }
      }){
        Text("My Button")
      }
    }
}

showAd() else statement executes and displays "not ready". help.