Cooldown time on button click

What I am trying to accomplish is almost identical to what is done in the game Adventure capitalist. When you click on one of the companies, there is a "cooldown" timer. I put that in quotations because you don't get the money until after the timer has finished. I have looked at the other suggested questions and have managed to create the code below

 public UnityEngine.UI.Text showCurrency;
     public int money = 0;
     public int moneyPerClick = 1;
     public float timeToCollect = 3.0F;
     private float timeStamp;
     private bool buttonClicked;    
 
     void Start()
     {
         timeStamp = Time.time + timeToCollect;
     }
 
     void Update()
     {
         showCurrency.text = "Money: " + money;
         if(buttonClicked && timeStamp > 0.0F)
         {
             timeStamp -= Time.time;
                 
         }
         if (timeStamp == 0.0F)
             {
                 money += moneyPerClick;
             }
     }
 
     public bool Clicked()
     {
         buttonClicked = true;
         return buttonClicked;        
     }
 
     
 }

I currently get 1 error but that started happening after I added the showCurrency.text = "Money: " + money; part. So that needs to be fixed.

The code, as far as I can tell, it not working. I don't have the cooldown effect working with the image fill (which will be a problem for another day) So I can't actually see if the timer is counting down, but I guess I could have a Debug.Log and have a system.out line to test that. The other thing that isn't working is I'm not getting the new money amount to show up on screen.

This code is a beginners best guess at how it would be layed out and it is where I'm at. If it looks like I am using the methods wrong, that's probably because I am. Any further information to at least point me in the right direction would be greatly appreciated.