I have ordered a D225 doorbell to go with my Tapo cameras.  
I would like to have it hardwired but we don't have a doorbell in our home that works. 

Can I use this system to connect the doorbell camera for always on function.  
 

The specs say the following:

Extra Long 19.7ft Cord 18V500mA Doorbell Transformer

Continuously converts 110/120v to 18volt 500ma.

current rating 0.5 Amps

maximum frequency 60 Hz