Installing yolov8 on RPI5 is very simple:

sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get autoremove -y
python3 -m venv yolo_env
source yolo_env/bin/activate
pip3 install ultralytics

But I'm still working on the Coral TPU.

The RPI5 alone takes about 400-500ms for a 640x480 image using a yolov8-n.pt model, where the Jetson Nano only takes about 70ms. My hope is the Coral TPU will help to get closer to Nano performance.