For people with at least one acceptance:
There's nothing stopping you from thinking through the comparison of schools where you still have a possibility of admission now.
If you later got an offer on April 29, which would you choose?
If you would not choose the school you are still waiting to hear from, do you want to still wait to hear from them, or do you want to start making plans for the school you now have?
Of course you don't have control over when you hear back from schools. But you don't have to be passive while you wait to hear, either.
Read up, look up, check up on the schools still in the running now so you will know what to do.
A later offer of admission might have a very short time window for you to accept or decline, and there may not be any financial aid information available to you within that time window.