Google-groups – See all the posts across all Google Groups

Although not an official solution I suppose since it uses Google Alerts instead, but it may work provided when people reply via email they leave the original message (I haven't actually tried it, just thinking outside of the box a bit.):

• Figure out what your signature in reply messages looks like. Typically it's a combination of your Display Name in your profile and the "secure" email address (the first several characters followed by ...@mail.server)
• Go to the "Edit My Membership" for the group.
• Set How do you want to read this group? to No Email.
• Save settings
• Go back to the "Edit My Membership" for the group.
• Click the "Get email alerts of messages containing specific keywords" link.
• For the search terms, enter in the information from the first step. It should be something like "First Last email" or "John Smith jsmi"
• Keep the first drop down (Type) set to Discussions
• Configure the rest to your liking
• Click on the Create Alert button.

Now, the reply you posted is under review due to the particular Google Group's Settings. Now, you cannot know when it gets accepted (in the same way as we - users with less reputation try to edit a post in SE and get the "until it is peer-reviewed" message. When the edit is accepted, we do not receive any email-notifications nor any inbox message in SE. All we can do is check if our reputation in the particular SE site has incresed and if it has, see the reason behind it).

All you can do is go back to the Group once in a while and manually check if what you posted is accepted.

You cannot see the queue of pending post as you are not a moderator or admin of the group (or whatever they call), in the same way as we cannot see the list of question and answer edits waiting to get approved in SE - only members with very high reputation can do it.