If you're using Azure then you can configure it has automatic process as shown below.
If not, you must do it manually as follows:
You have to create a db script and after that you can run it on your production db.
Script: PM> Update-Database
Refer to this document: How to Get a SQL Script
Another option that I often utilise is:
To conduct migrations against the production database, I modify my
string to reflect the production database, then execute: