I have an older Brother DCP-J525W inkjet printer that is according to the Brother site not supporting Monterey. But if I understand correctly, I will still be able to print via AirPrint after upgrading to Monterey, right?
Unfortunately I couldn't find any specific information for that printer with regards to AirPrint and Monterey, which I'm guessing you have also realized. I've been looking into Brother + Monterey + AirPrint myself, and came upon this help page from Brother: