Adventitious roots on clonestems

I clone in cubes(Rapid Rooters) or rockwool instead of directly in soil, so seeing roots isn't hard for me. I wouldn't go digging for roots though, it's easy to damage them. If you give a cutting a gentle pull and you meet resistance then it's probably started rooting. If they're growing they've rooted. Your clones don't have a ton of floor room to bury them down real far, you want some space for airflow, etc. It's probably best to top them.