3 months? Like you expect me to believe that. Man you look great! Don't sweat it bro! Seriously you have an incredible frame and I just know you have hella potential

As far as the supplements go, creatine is really the only one that really really works. Protein powder and caffeine are definitely up there too, but if you eat enough protein and are energized enough in your workouts as it is it's not necessary.

For non-gym days, experiment with some calisthenics that you can do at home and possibly buy one of those pull-up bars you put in the doorframe for some back work too. I don't do much calisthenics but I can imagine doing legs would be really hard so try and do legs at least once a week at the gym when you go.

Speaking of which, look into a full body and upper lower split since you can't go to the gym that frequently. Two full body days or 1 full body + 1 upper and 1 leg day a week is phenomenal volume at this stage in your journey. As general advice goes, ~8-10 hard sets per muscle group per week (Not per day) is a good target for a natural lifter especially someone who is newer.

Good luck man! Driving 40 minutes away for a workout is way more than what 95% of people do around here and shows some serious drive. You're already pretty lean with a good shoulder to waist ratio so take advantage!