I think that’s a great plan. See where your times fall and if you can get the attention of the coaches. As a Junior National qualifier, you should be reasonably competitive. Raising your AI into the 220+ range would also be helpful. Having UChicago as a strong option is a great luxury.
BTW, here’s Harvard’s top 2014-2015 times, to compare with Yale’s:
http://static.psbin.com/k/n/ll55d2zd401pdc/SDW_1415_top_times_final.pdf
At a glance, they look pretty similar. If you’re in range for one, you should be in range for both. Both are quite a bit slower than at a top program like Stanford:
http://gostanford.com/fls/30600/pdf/w-swimming/20150327_top_times.pdf?DB_OEM_ID=30600
Regardless, by September you should be way ahead of most people.