Thoguh you have started antibiotic therapy prior to surgery, you will NOT have completed treatment, and will likely still have many more strep bacteria still present, even if you remain asymptomatic. Realize that antibiotics work by first killing the sensitive strains of strep that infect your throat, and hopefully killing at least some of the more resistant strains that are present in any billions-of-bacteria colonies that are multiplying and mutating. Soon, only the resistant strains remain, but by then, in most cases of healthy individuals, your own immune defenses are "cranked-up" and able to kill the remaining nasty bugs.
If you don't give your body time to do its work, along with completing your antibiotic prescription as directed, you are at increased risk for laryngospasm (major anesthesia concern) and a higher risk of infection in your operative site. Throat and airway infections are best completely healed before considering elective surgery. Sure these are "theoretically-increased" risks, but should you be the rare exception that experiences one of them, you are NOT "theoretically" dead; it's the real deal.
I know it's a huge hassle to rearrange time off work, vacation, help with recovery, etc. We all get that. But even a small risk of something terrible happening is too big a risk to take! Talk to your doctor. Best wishes for a speedy recovery.