According to dox, Variant object has the following properties: .incoming which is true if there is incoming inventory and .next_incoming_date which is only a date.
To show amount, you may use an App, like Mechanic, which will read the incoming inventory data from the database and put it into variant metafield. This metafield can be read in liquid and displayed on frontend.
Or you can edit metafield manually each time you add incoming inventory, but this is not very convenient.