U.S. (and her closest allies) know almost all of what Iran does during these war games. I give you one hint: "Trump with his big mouth said that, at the time of RQ4A shooting down, that the Iranian AD unit did not get permission from command center and decided to shoot down the RQ4A on its own". Similar stupid thing was said when the Iranian space launch failed, which U.S. military command cringed at his stupidity to divulge information which tells the other side what U.S. is doing and how much they have infiltrated the networks.
I have no idea how much, but I would assume most of Iran's networks have been compromised and infiltrated.