Creating object on different model with logic to another model

Question

Say I have 2 models, One is Order and the other is Item.

STATUS_CHOICES = (
    ('Un Finished', 'Un Finished'),
    ('In Progress', 'In Progress'),
    ('Assigned', 'Assigned For PickUp'),
    ('Picked Up', 'Picked Up'),
    ('Completed', 'Completed'),
)

class Order(models.Model):
    product = models.CharField(max_length=100)
    # ...
    status = models.CharField(
        max_length=150, choices=STATUS_CHOICES, default='Un Finished')

#item

class Item(models.Model):
    name = models.CharField(max_length=100)
    def __str__(self):
        return self.name

    class Meta:
        ordering = ["updated"]

If any of the object status in the Order model changes to Completed I want to automatically create the object in the Item models. Let's say

Model Order contains and object:

{id: 12 , product : "Product Name", status : "Completed"}

Then here I want to update the Item with an object containing that information. How I can do this in a simpler way?

I found some articles that suggest using Django signals but I'm new to Django and need little help to reproduce the solution.