i would put some mulch on top of the soil
to try and keep the moisture even, and slow evaporation.
with new growth, i am guessing it has got roots
so, i would wait a week or 2, then
put it outside to get more sun.
the fruit are green and small.
i take it those fruit are from your fathers tree ?
they dont look ripe o me.
do you know what type guava ?
white ? Red ? Mexican ? Thai ?