MAGENTO 2 FREE SHIPPING BAR
https://www.cynoinfotech.com/product/free-shippingbar-magento2-extension/
Free shipping bar extension helps to notify customers about their minimum cart total to get free shipping. Customer likes to buy more products to reach free shipping cart value. The minimum total value is required to get free shipping. This extension calculates the difference between the current cart total and the free shipping goal automatically. Admin can set free shipping total as per product value. After customers successfully achieved a free shipping value, they notify with a pop-up message. Customers can get notifications with the popup that they reach a free shipping goal.