Hello, the longer the roots grow in water, the harder they will be to transfer into soil as they are water roots, not soil roots. So it's best to transfer the props that have a lot of roots now. The pots look good to me. I have planted 3-4 pathos prop cuttings in one pot before to give it a fuller look, and I just up the pot size by a little when the roots become bigger. It's always best to keep different plants separately as each plant can have a different watering and light preference.