Every treatment you provide needs to be very patient-specific because every patient is unique!
There are a multitude of PT problems the patient could have depending on the outcomes of the surgery, any complications, and baseline status. You need to look at two major areas
1. Chest status - the cardioresp part
2. Mobility - the MSK part.

1. Is the patient's chest stable enough to return home? Is he on room air or supplemental O2? Is his O2 saturation stable (generally over 90% but depends on baseline) at rest and with activity? Is he retaining or clearing secretions?

2. Is the patient mobilizing safely and independently? If not - what are you going to do about it? Are you going to give him a mobility aid? Send him for further rehabilitation? Keep him longer to allow him to strengthen further?

These are just some of the things to get you thinking about potential patient discharge. Everyone is unique. Make sure you look at chest and mobility before you make any final decisions.