Finally a diagnosis!

My son underwent a psychoeducational evaluation recently. I've only recieved half the results but he finally has an Autism diagnosis...at nearly 18 years old. He has severe learning disabilities in academics, memory, executive functioning, adaptive functioning, and affect regulation. As well as mild to moderate in cognitive ability and attention.

He has prior diagnoses such as the CPTSD, anxiety, depression, ODD, ADHD, OCD... Some which have he doesn't seem to have anymore which is fantastic!!

I have concerns now that he has these diagnoses as he's almost a legal adult. There are next to nothing for supports for adults. I'm not sure where to turn now. I'm in northern BC Canada. So I'm in search of online resources if you know of anything!