Will Apple watch 5 do this (and only this)?

I'd like to get the Apple watch 5 as my first ever fitness tracker. There are only two things that are essential for me:

(1) Ability to see the time, and my heart rate, just by glancing. I think that's no problem with AlwaysOn.

(2) Ability to see NOTHING else but those things during my workout. I want the option of NOT being made aware in any way of incoming calls, text messages, or notifications of any kind.

I've seen threads about earlier models in which people got advice about how to turn off all notifications, and reported that every recommendation failed, they could not prevent the watch from behaving in some way that alerted them to calls.

Thank you for your help!