Awesome...when I set up a new NPT I add livestock the same day-usually after multi water only changes to get the water clear.
If it has been 24h since you set it up you may want to make a 25-50% water only change first and then add the fish...monitor and make needed water only changes until the plants start to actively grow-the number, volume, frequency of these water change needs are based on tank size and bioload (number of fish and livestock added) until the plants can keep up with them to keep the water quality safe.
Hey oldfishlady ;) I have used to the topsoil method like you do and I must say im so happy with it. I had no cloudlynesn or nothing and now its all planted about 80 % of the tank is planted. So I was thinking would it be ok to add fish tomorrow?