How to make a progress bar go up after two objects collide?

So I have a progress bar but I would like to know how to make it fill up after my player finishes a task. The idea would be for the player to put objects into other objects (example food into a dog bowl). Here is my entire progress bar script w$$anonymous$$ch I got after following along DevDuck's tutorial on progress bars.

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using UnityEngine.Events;

public class ProgressBar : MonoBehaviour { private Slider slider;

 public float FillSpeed = 0.5f;

 private float targetProgress = 0;
 

 
 private void Awake()
 {
     slider = gameObject.GetComponent<Slider>();
 }

 // Start is called before the first frame update
 void Start()
 {
     IncrementProgress(.00f);
 }

 // Update is called once per frame
 void Update()
 {
     if (slider.value < targetProgress)
         slider.value += FillSpeed * Time.deltaTime;
 }


 public void IncrementProgress(float newProgress)
 {
     targetProgress = slider.value + newProgress;
     
 }

 void OnCollisionEnter(Collision col){
     if(col.gameObject.tag == "dog Bowl"){
         IncrementProgress(.5f);}
     if(col.gameObject.tag == "dishwasher"){
         IncrementProgress(.25f);}
     if(col.gameObject.tag == "dishwasher"){
         IncrementProgress(.25f);}
 }

}

The part at the end was my attempt at getting Unity to recognize a collision and fill up the progress bar after detecting the collision. THANKS!