Unity C# Input System get any key and get the key name that was pressed

I am trying to make a rebinding system but the issue isn't rebinding the keys, it's getting what key was last pressed in order to determine which key to change the binding to. here's what I have so far.

public void SetBinding(GameObject key){
    if(key.GetComponent<Button>()){
        Text text = key.GetComponentInChildren<Text>();
        Button button = key.GetComponent<Button>();

        text.text = "-";
        button.interactable = false;
        Debug.Log("pressed");
         
        StartCoroutine(WaitForKey((string key)=> {
            text.text = key;
            button.interactable = true;

            Debug.Log($"Returned callback: {key}");
        }));

    }

}

IEnumerator WaitForKey(System.Action<string> callback){
    while(!Keyboard.current.anyKey.wasPressedThisFrame){
        yield return new WaitForEndOfFrame(); 
        
        // get the key that was pressed using unity's input system package.
         
    }
}