Question around what is supported now around delegation in hybrid for Send-As and Send On Behalf

Hi there 

have a question around what is possible now with send-as and SendOnBehalf for shared/resource mailboxes more so than user mailboxes microsoft released an update in april to allow delegation between user mailboxes using

Set-OrganizationConfig -ACLableSyncedObjectEnabled $True - meaning any future mailboxes migrated to EOL will be delegatable from onprem and visa versa
any mailboxes moved prior have to have the MSExchRecipientDisplayType attribute stamped with the value - 
-1073741818
I was referring to this article here - https://docs.microsoft.com/en-us/exchange/hybrid-deployment/set-up-delegated-mailbox-permissions
However - im just looking for a simple clear explanation of how to get send-as and send on Behalf working for instance between cloud and onprem - say where the user is in the cloud and the other user mailbox is onprem
will this change suffice? Also what is needed for shared mailboxes which is a big one and resource mailboxes?