How to Show Custom Popup on click of “Proceed to Checkout” Button From Minicart in Magento 2

 When the "Proceed to Checkout" button is clicked, Magento 2 by default directs the user to the checkout page.

However, when the "Proceed to checkout" button in Magento 2 is hit, one might want to display a popup on the mini cart depending on the needs of the business.

A customized sales message, additional instructions, or offer-related information on the mini cart may be displayed in the popup at that point in the consumer or business's buying cycle.

I've presented a programmatic method to show a custom popup on click of “Proceed to Checkout” button from Minicart Magento 2.

For programmatically solution, Visit :
https://meetanshi.com/blog/show-custom-popup-on-click-of-proceed-to-checkout-button-from-minicart-in-magento-2/