OnePlus 9 and 9 pro launched Globally on March 2021. It has great flagship level setup of cameras which is good enough. But still people want a working Gcam with good tuning of colors and natural Google photo processing. So here is the Working Google camera for both oneplus 9 and OnePlus 9 Pro .
Oneplus 9&9Pro Camera:-
Primary: 48MP Sony IMX 789,f/1.8
Secondary: 50MP Sony IMX766 ultra-wide, f/2.2,
8MP 3.3x telephoto, f/2.4, OIS
Quaternary: 2MP monochrome sensor
Front : 16MP Sony IMX471, f/2.4
Oneplus 9 has same cameras as 9 pro except telephoto.

Oneplus 9 & 9 pro Gcam Download :-
LMC8.4_R8_Snapcam – link
XML Config – file
HOW TO LOAD XML FILE :-
1) Download XML
2) Open your preferred GCam
3) Double Tap in between Camera Shutter Button and Camera switch button
4) Find the downloaded xml then tap on it and apply
NOTE : slowmotion , ois may not work . check this website frequently for updated gcams .