If the value is populated, set the expectations of your users so that they see this value. Let them know that the system is working to return the value …
Give the user the feeling of control (system status)
At first glance, the use of – gives the value a zero or unimportant appearance.
If the application will certainly provide a value, be it between 0% and 100%, it is essential to show them the final result. system state.
Jakob Nielsen points out Visibility of the system state:
The system should always keep users informed of what is happening, through an appropriate return of information within a reasonable time.
How to view status
Here you have a choice. You could:
I did not mention a percent loading bar, since your final value is a percentage itself.