Is there already a protective cover for the HTC to buy?

Hello How long will the HTC U23 Pro be supplied with Android security updates? I have found absolutely nothing on the net. Neither from the manufacturer nor from various other sites. In principle, the phone would be very interesting; but if updates are already over after 3 years (or less?), then there are other alternatives (possibly less powerful). Samsung is already doing a good job (finally) with 5 years of security updates!