Having multiple objects fire prefabs in different times C#

I'm trying to have multiple objects fire from the same prefab but its not working. I created an array to hold the prefabs and using a coroutine to initiate it. Any help would be much appreciated thank you.

The code looks like this:

Adding the Prefab Variables

 public GameObject[] bossWeapons;

 //Prefab to instantiate
 public GameObject EnemyAmmo_Prefab;

 //Speed of ammo
 public int AmmoSpeed = 1000;

Setting up the Coroutine

  IEnumerator bossWeaponFire()
     {           
         yield return new WaitForSeconds(2.0f);
 
         for (int i = 0; i < bossWeapons.Length; i++ )
         {
             bossWeapons[i] = Instantiate(EnemyAmmo_Prefab, GameObject.Find("Enemy_Ammo_spawnPoint").transform.position, Quaternion.identity) as GameObject;
 
             //Uses rigidbody to move the bullet
             bossWeapons[i].rigidbody.AddForce(Vector3.down * AmmoSpeed);
 
             yield return null;
         }
     }

Running the Coroutine

  void Start()
     {
         StartCoroutine(bossWeaponFire());
     }