If this is anything like last time, the cubesats are onboard the Cygnus as cargo, to be deployed from either the ISS’s cubesat deployer at some point in the future, or they are on some other launcher system, to be deployed after the Cygnus departs the ISS.
Yep. Only 3 sats are going to be deployed from Cygnus itself.
The ThinSats will be deployed at launch off the second stage.
Seeker is going to be deployed either on launch or after undocking.
NSLSAT-1 is to be launched after undocking at a 500km orbit.