Leave the bandage on for 3 days, then take it off. You can shower with it on anytime. If it comes off sooner than 3 days, don’t panic… just leave it open… a bandage is not required. This tiny hole usually heals easily within 5 days. The only problems related to the wound are;
Bleeding - if you notice any bleeding from the wound, just pinch the hole with a cloth to maintain direct pressure for 5 minutes. This is similar to how you would treat a small cut from shaving. Call if bleeding continues even after applying direct pressure. Blood in the ejaculate in the weeks following surgery is common and of no concern.
Infection - this is quite unlikely to occur but is easily treated when it does. Suspect infection if there is a creamy discharge coming from the wound, or if the wound hasn’t completely closed within 5 days. Treat infection by wiping the wound with peroxide twice daily and applying polysporin ointment after. Cover with a bandaid so the ointment doesn’t rub off.