Only on Cumulus stations.
And syndicated for any other stations to pick up. Just like Rush's show was.
Granted, I doubt that all of the stations that carried Rush will carry Bongino, but that decision is out of the syndicator's hands, that's entirely the decision of each individual station.
Bongino was already with Cumulus. It seems quite possible that Rush's empire will collapse, or at least be drastically shrunk, with networks like Cumulus breaking away with their own talent.
Unfortunately for EIB, there was no heir apparent to take over the golden EIB microphone, so radio networks are on their own to fill the vacuum left behind. I'm sure any contracts EIB had with networks are worthless without El Rushbo at the mic.