If he sleep a lot that's fine, newborns tend to sleep a lot but from 2-3 months they will start being awake more. At first I used to do only once or twice a day, a minute at a time at most. Their head control is not good so they won't like it. Slowly increase the frequency & duration once they are more awake & used to it. Good luck!
It's best to start tummy time when your baby's neck muscles are stronger and they can hold their heads up. Try it just after bath time when your baby is alert and active.
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I actually put him on my chest and he like to lift his head to look at me.
I usually do it after bath time, and just for a minute or 2
When baby wakes n play full let him have his tummy time ..
I did so for a while before or after shower.
After bath time :)