Unless you have relatively short legs for your height (judging by seat height), your stem is probably pretty close. Try riding on the tops of the bars vs the hoods, which will give you an idea with regards to reach. If you’re riding on the hoods (as far as your arms can go) for 100-200mi and still feel cramped, then see if you can source a longer stem to try. Until then, I agree with everyone else, and take the bike out a few times and enjoy it.
My personal experience is that if I haven’t ridden over the winter, I often start out the season with my spacers under the stem, making the bar higher. As the season progresses, I move my spacers above the stem, lowering it. Getting your body acclimated is important!