Normally, you get a good feel around the early afternoon, but, IMHO, the Fake News Media will never tell you what the real numbers of TV viewers was!!! My own estimate after searching the TV stations and multiple live feeds is between 20-25 million people tuned in to catch the Trump Rally address.
Thanks jlagrayfox!
There were about 950 thousand from the info listed in Plushaye’s post, so I can see 20 to 25 million people watched President Trump’s rally.