Procaine penicillin is only given once a day since it is long-acting. I had just done a few bumblefoot surgeries last month, and this case makes me nervous. Let us know how he does.
Sometimes they will have red streaks up the leg--does the other leg have any? I would start him on penicillin just in case. Then I would open the bad foot up again. Soak it in weak betadine and wash it off before cutting. Sometimes you have to really squeeze in different directions to get a...
You can just file down the points so he does not hurt any hens. If the bumblefoot is causing him pain or he is limping, or it is swollen, I would do the surgey on the worst one, wait a week or two, and do the other side.