Letting out of coop

So my husband and I are in a bit of a disagreement, we recently got five chickens. Their coop is outside but it's not big. I would like to let them roam starting tomorrow night. I know you should start later in the day so they don't go too far. They have been outside in their coop about a week and in their coop in the garage for 2 weeks before that. They are about 12 weeks old. We don't have a fenced in area so if they don't come back, they are gone. Is this too early? Picture of definitely a roo.