If there is blood supply to it then it can heal. I cannot tell from the pictures if that's the case. Also depends on how much damage is done by infection and if tissue dies off. If it dies it will turn black. I would keep it clean, covered in ointment, and continue the antibiotics, and...
Yes, I would continue the antibiotic. If you have bad smell, it's needed.
The most common dose of enrofloxacin is 10mg/kg (I've seen it as high as 15mg/kg in a few places), twice a day. Since your medication is a 20% solution, that should be 200mg/ml. So if your bird is 6 lbs, that would be...
OK, that contains enrofloxacin. What dose are you giving? It's usually give for 5 days, so you may not see improvement immediately, takes time for the medication to get in there and work.
If there is a foul smell then it's likely infected. You will need an antibiotic. I don't know what resources you have there, but amoxicillin or penicillin would be good, or even cephalexin. The longer it goes untreated the less likely recovery becomes, it could become septic.