Kpro RSX 2004 type s

Looking to get kpro for my car and wanted to know who yall went through to get yours done. I know theres the trusted retailers list but a few of the sites say it could take till may to get my ecu back.
Do I lose my ecu until may? Or is it a certain day you send it in like on a waitlist kind of deal.
Id like to know your thoughts. I skimmed through these forums and people talk about the process afterwards but I want to know how to actually get it ordered.
Any replies can be helpful, thank you