TBH you won't notice much difference between 350Mbs and 500Mbs in normal use except for downloading large files.
You will need to wait until everything is set up and then check the Configuration tab in the Hub Settings to see the speed that they have set you up with.
*********************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.