Just run the following js code -

require( [ 'Magento_Checkout/js/model/quote', 'Magento_Checkout/js/model/cart/totals-processor/default' ], function( quote, totalsDefaultProvider ) { totalsDefaultProvider.estimateTotals(quote.shippingAddress()); } ); 

For more information, please refer to this article.

Disclaimer: I am the CEO of MexBS (the company who published this article)

Just run the following js code -

require( [ 'Magento_Checkout/js/model/quote', 'Magento_Checkout/js/model/cart/totals-processor/default' ], function( quote, totalsDefaultProvider ) { totalsDefaultProvider.estimateTotals(quote.shippingAddress()); } );