Due to some family difficulties, I have not been using my S60 for almost a month. Car only has 47k miles.

The oil is fresh Mobil 1, the tank is filled with Premium, and I am going to use a Deltran Battery Tender Plus to keep the battery charged.

Will this temporary inactivity of non-driving hurt the engine or Turbo in any way?

I know the tires will lose some pressure.

 

If you are going to start driving the car again now or soon there is nothing to do other than check tire pressures and fluid levels before driving it. If it is going to sit for a while yet add some fuel stabilizer to the tank, following the directions on the bottle for proper amount, then start and run the engine for 5 minutes to thoroughly mix and distribute the treated fuel throughout the entire fuel system. Would be best if the engine was started and ran for 5-10 minutes once a month during prolonged storage.

 

1 month is very little. As pkrface mentions, is best to run the engine 5-10 min every 2-3 weeks. It helps prevent the piston rings from getting gummed up/rusting, although your engine has quite low miles and is still very clean. I would be careful with keeping the battery charged. Better disconnect it. Those vehicles are known to have issues when charging the battery (it affects some electronics), and the ignition key should be in position II whenever attempting to recharge or plug back the battery.

When driving the car back again, go slowly with the brakes to allow the rust build on rotors to slowly came off.