Professional training for a 4mo puppy – worth it?

I've actually already signed up for the training so this is more about managing my expectations. My Cardigan corgi will be right around 4 months old when he starts professional 1:1 lessons. He is signed up for 12 x 3hour sessions spread out over about 2.5 months. It isn't all just obedience drills the entire time they take him to parks, patios, dog/human socialization and do calming exercises as well – in addition to naps. This is also the place we did his puppy classes and will be doing other group classes and we're totally aligned with the trainer's process. The goal is to hopefully have him calm, obedient and non-reactive enough to take him to work with me at least for a half day a few times a week by 1 year.

However I find with him I can walk him about maybe 10 minutes until his brain gasses out and he goes full gremlin mode. He does focus on training when we're doing it but again I can do about 10 minutes until his mind starts to wonder. So I question how much he'll be able to really pick up with professional training and it may feel more like glorified day care. Has anyone had experience taking their young puppy to professional training? Was it worth it? Did you see behavioral improvements beyond just obedience? I'm hoping they can kick start the behaviors we want and give me homework since I've unfortunately forgotten more about training (my previous Cardi I took up to good citizen) than I remember.