When do I get certified that I'm "ready" to date again?

Basically been a roommate/co-parent for the last 2+years of 13 year marriage. Slept on the couch since the start of July & moved out in Jan when divorce was finalized. I'm not upset about the divorce & wish her the best, very upset about losing time with my 8 y/o daughter.

Started talking to my sisters' friend and we're hitting it off so well i am hesistant. Everyone & everywhere says "don't get into a relationship until you're ready". Just want some opinions when some of y'all knew you had reached that point?