What are the odds that an orchiectomy will reduce the size of the prostate if you have prostate cancer at 87?

I have had prostate cancer for years, now all of a sudden a new urologist says I need my testicles removed to slow the growth. Unless it will reduce the size of the prostate and allow me to urinate without a catheter, why shouldn't I just stick with the injections if it accomplishes the same thing chemically? Is there any benefit to surgery that is worth the pain and risk?

What are the odds that an orchiectomy will reduce the size of the prostate if you have prostate cancer at 87?
i'd get another opinion.