Can I use Air Pods Pro if I don't have an iPhone?

Yes, you can use them as a pair of normal Bluetooth headphones, but if it is a non-Apple device you will not have features like spatial audio.

Set up AirPods with your Mac and other Bluetooth devices - Apple Support

Yes. AirPods Pro work with iPads, Macs, Apple TVs and iPods in addition to iPhones.

You can also connect them to Windows PCs and Android devices as regular Bluetooth headphones but will obviously not have all the Siri features in those cases.