Data Transfer speed of iphone XR

What is the maximum network speed an iphone XR can handle? Exampke what is the maximum data transfer speed I can get.

The network it is connected to is a 800.11 ax capable of ~1000 Mpbs.

This question is not about “it all depends in the network” etc. It is about the capability of the phone.

I have read various specifications giving different answers. I think the max speed is 450 Mpbs. But difficult to verify.

Can anyone help?