No. If they ask how I think they're doing, I will tell them, or if they screw something up, I will let them know.

In my opinion, placating the therapist by reassuring them like they were a preschooler that they're doing a good job or making them feel good about themselves so you'll stay on their good side is a) not the point of the therapy relationship, b) kind of manipulative, and c) for some clients probably replicates the relationships they have in real life, so, again, not the point of the therapy relationship as well as stymieing any improvement by the client.
. . .