I couldn't answer that about on-line Psych programs, as I went to an on-campus program where the lectures were absolutely useless. Our professor was Freudian in her approach.
So, wherever you go, you'll probably be largely self taught by necessity. But in Psych, there is a whole bunch of clinical and social context you have to consider when prescribing, and also a lot of subjective assessment. It won't be found in any book.
I would suggest getting an RN job in the field, if you don't work there already, both for the clinical experience, and also for the need to meet future potential preceptors, which schools
generally don't provide.
Wherever you go, make sure it is accredited, and that you'll be eligible to sit for the AANC certification exams, without which you cannot bill Medicare or most insurances.
I would love to hear a ringing endorsement from any graduate of an online Psych program. If that is you and you are doing well, please let us know!