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.

I'm in the same position as @stevenpatz in that moving from WBM to CM is proving difficult and WBE is the blocker to the upgrade to 11.x.

If working on an 11.x version of WBE 2.x is an option I'd be keen to contribute to that too.

@stevenpatz, I have an issue open on the WBE Issue queue that gets the 2.x branch working on D11. If you could test that and provide feedback, that would be appreciated.

https://www.drupal.org/project/workbench_email/issues/3507315 ✨ Upgrade the 2.x branch for Drupal 11 Active

Glad to see some progress. My priorities at work switched a bit and I won't be looking at a D11 upgrade until the end of the year at the earliest.
edited to add: looks like your patches were merged. This is encouraging.