This module creates an "office hours" or "opening hours" field.
It have also an 'open now'/'closed now' indicator.
Install and enable the module.
Create a new contenttype and select the field: Office hours.
There are several settings to customize the output.
In 'Manage display' there are a lot of settings to custominze the outcome. You find the 'open now'/'closed now' indicator.here.