How to ensure root view controller is not nil, when handling deep link from home widgets for app fresh launched case?

Question

Currently, this is how I handle deep link from home widgets.

extension UIWindow {
    //
    // https://stackoverflow.com/a/58031897/72437
    //
    static var key: UIWindow? {
        // Get connected scenes
        UIApplication
            .shared
            .connectedScenes
            .compactMap { $0 as? UIWindowScene }
            .flatMap { $0.windows }
            .first { $0.isKeyWindow }
    }
}

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    // App launched for the first time
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // https://stackoverflow.com/questions/63697132/detect-app-launch-from-widgetkit-widget-extension
        if let url = connectionOptions.urlContexts.first?.url {
            handleIncomingURL(url)
        }
    }
    
    // App restored from background stack
    func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
        if let url = URLContexts.first?.url {
            handleIncomingURL(url)
        }
    }

    private func handleIncomingURL(_ url: URL) {
        guard let rootViewController = UIWindow.key?.rootViewController else { return }

        ...
    }
}

There are 2 cases I need to handle when user clicks on the home widget.

1. App launched freshly.
2. App restored from background stack.

In my deep link handling logic (function handleIncomingURL), I need a non nil UIViewController, so that I can perform appropriate action to handle home widget's deep link.

In case "App restored from background stack", everything is fine because the UIWindow.key?.rootViewController is able provide me a non nil UIViewController.

However, in the case of "App launched freshly", I am always getting a nil result from UIWindow.key?.rootViewController.

Is there a way for me to obtain a non nil UIViewController during app fresh launched, during home widget's deep link handling?