
Migration Manager and SPMT are the options for that scenario that are offered by Microsoft.
Overview: Migrate your file shares to Microsoft 365
https://learn.microsoft.com/en-us/sharepointmigration/mm-get-started
I strongly recommend you to read this document for planning.
For migration of more than 100TB data, you should contact Microsoft support.
And you can migrate 1TB data per day (for medium files) with recommended tools. So you should plan about 2 years to migrate all data (600TB) to SPO.
General migration performance guidance
https://learn.microsoft.com/en-us/sharepointmigration/sharepoint-online-and-onedrive-migration-speed#large-migrations-over-100tb
And, FastTrack service also can help your migration.
They have strong knowledge about best practices of data migration.
Data Migration
https://learn.microsoft.com/en-us/fasttrack/data-migration
I hope your migration project goes well.