You seem more than physically prepared. If you can push yourself at get an 18 on your 3 mile run, you can get yourself a 300 PFT, which may put you in a good position to be an honor graduate, which will net you E-3 (LCPL). But overall, just keep your mouth shut, and your ears open. Don't expect anything because you'll experience much confusion throughout your first few weeks in Boot Camp. But don't worry, 90% of BC is mental. Just listen to your DIs and do what they say - and learn everything they tell you to learn. If things seem overly stressful at times, just remember that everything at BC is designed to break you down and build you back up into a Marine. If you become overwhelmed, and you start to question your reasons for enlisting, remember why you're at BC, and know that thousands upon thousands of men in a similar position as yourself succeeded at earned that Eagle, Globe, and Anchor.
Good luck, future Marine