No one can really tell you how long he has. He needs to get treatment, and it could stop the cancer in its tracks. His Gleason score tells you a lot about how aggressive the cancer is, Find that out from the doctor.
You need to find a good doctor for Either a second opinion or a primary doctor, a Genito Urinary Oncologist, or a center of excellence like Mayo would give you the best chance of your husband having a remission.
Normally he would be considered for triple therapy. ADT plus abiraterone or a lutamide plus Chemo. Health is a major factor however. That’s why it’s so important to see a doctor. They may only want to do some of those things.
They also may want to do radiation on the prostate, the bone metz and the Lymph nodes. Depends on how many spots there are.
They could use Pluvicto early to try and kill everything. There are so many choices.
You could request a Decipher test to see how likely metastasis is to return soon.
Thanks