You can start by reading summaries or reviews of the comics you missed to get an overview. Then, set aside dedicated time each day or week to read a certain number of issues.
The key to catching up on comics is consistency. Allocate a specific time each day for reading. Another option is to join comic reading communities or forums to get recommendations and tips on which comics to start with and how to manage your reading schedule.
The best way to catch up on Batman comics is to make a list of key storylines and find them in your preferred format. Maybe start with classics like 'The Dark Knight Returns' or recent critically acclaimed runs. And don't forget to follow comic book news and reviews for guidance.
It's hard to predict exactly. The pace of the anime and the progress of the manga are subject to various factors, so it's not straightforward to determine when they'll align.