You say he has two implants so he should be able to hear and is progressing in school and at home. When you meet him you'll be surprised at what he can hear. All will go well......you won't let him get lost ;-)
I have an implant so I know a little about what can be expected. I have 2 young friends that had implants at a very early age and have watched them progress over the years and have talked to their parents extensively concerning their hearing loss.