The good news is that Gleason 3+4 is borderline: it's the lowest score that oncologists are even willing to call prostate cancer (it's lower risk than 4+3, which is also Gleason 7).

One likely recommendation is what they call "active surveillance", which means just more-frequent blood tests and scans to keep an eye on it. If PSA hits 10 or so (depending on the oncologist), they might consider trying some medication, but I think it would be less common to jump straight to surgery or radiation with only a 3+4 score.

The other good news is that the long-term survival rate for Gleason 3+4=7 with treatment is somewhere over 99%, I think.

There are probably cancer patients who need treatment urgently being triaged ahead of your husband, so in a sense, it's good news that they're not in a rush to see him, even though the wait is stressful. For me in 2021 it was straight into a hospital bed, being wheeled back and forth on a stretcher for a few days for endless tests and imaging while they tried to figure out what was happening, rushing into the operating room in the wee hours for 10+ hours of emergency surgery, then 3 1/2 months before I was stable enough to be allowed to go back home. Trust me, you don't want to be in a situation where they're eager to take him in a hurry. 🙂

In the meantime, many people in the forum have found this book very helpful for understanding prostate cancer, including your husband's situation. It's well worth a read (even though things have already changed a bit just since it was last updated in 2023.
https://www.amazon.ca/Patrick-Walshs-Surviving-Prostate-Cancer/dp/1538726866