I should have asked for spot and listen checks from Cyrus and Tetch (and Cujo), but I was in a hurry and forgot. I'm assuming since Tetch has blindsight and Cyrus has darkvision, that you guys probably travel without a light. Let me know if this is incorrect.
Since it sounds like Tash's group has a fire, and I assume you don't, you're definitely going to see the fire from quite a ways off, long before you get within their visual range. So you two will probably at least know their group is there before they know you are. If they aren't hiding, and are within the radius of the firelight, you'll see them from over 100 feet away, as you crest a small ridge line.
I'm going to say that Tetch doesn't know what the Order members sent to meet him look like, but that there is a secret phrase and answer to go with it to identify yourself as a member. (You guys can make something up.)