They can guess but it's not possible for these private institutions to "know" what policy changes the Fed will make because even the Fed doesn't know until they meet and vote. It's not practical for one of these institutions to individually request or receive special treatment or favors from the Fed. There is no one individual at the Fed empowered to grant any such request. Making any such attempt would subject the institution to having it's banking charter revoked.

Compare this to crypto where exchanges can and do grant themselves special treatment and secret monetary favors without any permission or oversight whatsoever.