is this available for a 2020 audi Q5

Hello ccf123c,

Thanks for asking the Apple Support Communities if you can use your iPhone or Apple Watch as a car key.

You will need to contact the dealership or car manufacturer to ask if they support this: Use your iPhone or Apple Watch as a car key - Apple Support

"A compatible car. To find out if your car is compatible with the Wallet app, contact the car's manufacturer or your dealership."

Cheers.