What's your goal with boxing - competing or training for fun and fitness?
Either way, 30 is not too late at all. Plenty of people start at that age or even older, and the reality is you've got advantages that an 18-year-old doesn't have: discipline, patience to learn the technique properly instead of just wanting to throw punches, and the ability to understand what your coach is explaining. What might be different is that recovery takes longer and you need to be more careful with injuries, but that's not a blocker - it's just about training smart.
The two months you've already put in are great for getting comfortable with the basic movements. From here on, how much you improve depends way more on your effort and consistency than on your age. If you train regularly, you've got a good coach watching your technique, and you don't smoke or drink too much, you can improve a lot. Maybe you won't reach the reflexes of a 20-year-old, but in terms of hand speed, footwork and tactics you'll go far - really far, even.
If the goal is to compete for real, you need to be honest with yourself: serious official competitions have divisions by age and weight, and in the open categories you've got people who've been training since they were 10. But if it's just about training, taking controlled shots in the occasional sparring session and building confidence and fitness, age is pretty much irrelevant. Keep up the pace you're at.