Moving from Workbench Moderation to Content Moderation

8.x-1.8 should work with 11.x
If it doesn't happy to fix any bugs
I have one site left using WBM (rather than CM) and it has a lot of custom integration that makes moving to CM more effort than updating WBM every time there's a new core major

There was a 2.x branch that had an update/drush migration command, I don't know if it still works

Sorry I wasn't clear. Workbench Email 3.x will only work with Drupal 11 correct?
My dilemma here is I have Workbench Email 2.x and next year I'm updating to Drupal 11, and the module won't be supported.

I did try the drush migration but it seems it doesn't work for Drupal 10.

Ah, I'm not opposed to considering an 11.x version of WBE 2.x or to fixing the migration script for D10

I can help test either fix. I'd say I lean more towards a 11.x version of WBE 2.x.