It’s actively happening right now - they are converting a batch of workspaces each day. I haven’t seen any update on how long they think it will take but I believe it’ll be a few months before it’s done - after all, they have literally millions of users, so imagine how many workspaces! So your data could be converted literally today, or in a few weeks/months; we’ll all have to have a little patience but at least it’s finally here.