Help me understand rebuild vs crate?

Did the machine shops give you an approximate lead time for how long they would be able to do your work? I know where I am that most machine shops are busy and have 2 - 3 month backlog.
3 weeks wait. They said they would tell me the size of the pistons I should purchased and then I should bring those to them for final hone and then balancing the rotating assembly with the new pistons.