Go to Theme Settings > (Upsell) Stock countdown

1 - Countdown

1.1 - Show Stock countdown?

Set the pending time for Countdown Timer Loop

1.2 - Time

1.3 - Countdown timmer

2 - Process bar

2.1 - Use progress bar

2.2 - Total items

3 - Translate labels

Message (You can leave it blank)

ex: Hurry! Only left in stock.

4 - Custom Background and color

4.1 - Progress color

4.2 - Background color

Result:

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From The4

Hope you success!!!