They don't specify that informations on their site because they know their Bluetooth modules are way inferior to what other brands are using. On oreo you can check yourself in the developer options. Be sure to connect them first. As an example my 1000x connect in 96khz/24bit mode.
All Bose BT headphones and headsets to date cannot handle more than SBC and AAC up to 44.1/16bit. Even if you had the option you would see no benefits and only a potential increase in battery usage. If you want hi-res you need to switch to another brand.