I can't offer much advice beyond what you have done. What you've done is the majority of what we do for injured wild birds. If you have a way to keep it separated from the others in a small, warm, darker and clean place, that sometimes help to alleviate stress and outdoor contaminants for the first day or two after injury.
If it's a large wound, reclean it and check the site for necrotic development (dead flesh will usually turn grey, white, green, or black, depending on progress of decay). If you see discolored skin like that, it's more likely to be infected rather than purging helpful liquids full of clotting and scabbing agents in an attempt to heal. Necrotic flesh means that the wounded area is dying off, not healing or scabbing over like it should.
If the liquid that's draining is clear, you probably don't have to worry- clear fluid is typically just serum, which is fine. If it's milky, that's typically a sign of infection.
EDIT: If the flesh around the wound is swollen or puffy, you can try icing it for a little bit with ice wrapped in a washcloth or paper towels. Don't leave the ice on for very long, 5-10 minutes on, 10 minutes off. Make sure you don't chill the bird, either, you want it warm.
You can try getting something like this:
http://www.amazon.com/Gentian-Violet-Solution-1-2oz/dp/B000NORDDK if you are still worried.
If it's a largely exposed wound, you can try putting gauze over it (if the turkey is unlikely to rip it off) or wrap gauze+ace bandages around the body of the bird (under the wings) so that the wound is not exposed to contaminants for a day or two. Any dressings should be changed at least 1 time daily.
But if it's not leaking milky fluids or showing necrotic flesh, I would say just clean and reapply the antibiotic cream.