Use of sales_quote_address_collect_totals_after events Magento 2.

Magento 2 you can use sales_quote_address_collect_totals_after event for Collect address total related data after Magento completed totals for a current quote.

Using the above event in the observer, you can fetch specific quote data, shipping_assignment, and total related data for a cart.

Simple code snippet for use events, Define events.xml

Create an Observer file to fetch quote related data,

You can use the above way your observer with the required data after collecting totals in Magento 2.

Check Use of sales_quote_address_collect_totals_before events Magento 2.