FreeFrags22 Google has not released Android QPR1 to AOSP yet. In fact they haven't been doing AOSP releases properly since Android 16 released.
Security patch backports were pushed to the Android Open Source Project on September 2nd but it wasn't done properly. Android 16 QPR1 was also supposed to be pushed to the AOSP on September 3rd and it was even confirmed they'd still be doing that but it hasn't happened.
Source: https://xcancel.com/GrapheneOS/status/1964754118653952027
If you read the post you can see what the current state is along with possible remediations for security patches at a minimum.
QPR1 porting cannot begin until it is pushed to AOSP. The answer to when is the same answer to how long is a piece of string right now, we don't know as the date provided for it by Google has been and gone. Please keep your eye on our socials and announcements here for future updates.
The update timeframe shouldn't be as bad as Android16 as better groundwork has taken place along with further improvements to the automation process for device support. However be mindful that QPR releases are not dissimilar in size than version upgrades and are not as run of the mill, by perception, as monthly updates are/were.