Speech therapy

Has anyone put their child in speech therapy??

My 21 month old has a really bad speech delay and a mild receptive delay- although, I don’t feel his receptive language is really that bad. During the evaluation, he literally did not follow any commands, and he usually does. The only command he complied with was naming 6 body parts- other than that, he wanted nothing to do with me the whole evaluation lol.

So he is going to be starting speech therapy, and I am getting worried it won’t help.

Did anyone do speech for their kid?? Was it helpful?