First of all, make sure that there is data for the category. Go into Health app, Browse (lower right), Activity. Tap on Cycling to see if any saved data.
Make sure "Group by" is set to Day (seems like that needs to be set to some value).
If you run the Shortcut while in the Shortcut, will output the number. Polished way is to add either a Show Notification or Alert action. Just select the default message text, delete it, and then tap the space again to get the option to tap on "Calculate" item to pass the output from Calculate to the message.