The waitlist often has turned into a recruiting tool for future applicants, younger students seeing that a senior-year friend was “waitlisted” instead of rejected and figuring they might as well try their luck too.
Often the number “waitlisted” approached or exceeded the number admitted! The past two years covid has made admission numbers look funny, but years prior to that were informative. You can sometimes find numbers in the Common Data Set reports. In 2019 for Northwestern 3,067 offered the waitlist, 55 eventually taken from it. UPenn offered 2,051, eventually accepted 101. WUSTL, well known for passing out waitlist slots, won’t even say how many are waitlisted!!
The point is that at many schools being on the waitlist at many schools did not mean you were almost an admit. So I don’t see how mentioning it now will tip things your way. YMMV