Given the size of the animal and the fact that the injury is a week old and the snake is still alive, I would think that with proper antibiotic treatment the animal should heal and recover just fine.
I have rehabbed smaller wild snakes with holes and gash that were pretty large and they recovered fine.
All you can do is wait and see what the vet says and make a decision than.
Your main enemy in this type of situation is infection but those are very treatable, once infection is under control, healing can start.
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