They are going to be rounding up people way faster than they can process them for deportation. Also all those farms and factories they were arrested in are still going to need cheap workers. So they'll just be rented out from the detention camps back to the places they worked before, and forced to work for basically nothing, because it perfectly legal in this country to pay prisoners literally pennies per hour. Meanwhile the farms and industries where they work as slaves and the private prison companies loaning them out will keep all the money the prisoners used to make in wages.