When you stitched you left enough space between them for drainage, yes? Change out dressing over stitches daily and keep your nose focused, any bad smell and the wound should probably be flushed with a 10:1 sterile water/Betadine solution and redressed). If no organs were punctured and infection can be held in check these guys are pretty tough.
Here is some VERY specific instructions on tube feeding: https://www.backyardchickens.com/t/...h-my-bird-pics-for-visuals-very-detailed-post
Best of luck!