IPEDS admission data for class of 2024 will not appear on the NCES website until June 2021, when that website rolls over to the fall 2020 freshmen data. It will appear sooner on colleges’ websites in the 2020-2021 Common Data Set, though most colleges won’t publish their next CDS until early 2021.
In the meantime, you will be able to find class of 2024 acceptance rates in campus news articles and, starting in the early fall, often in colleges’ class profiles on their admission websites.