The pull request should be ready for review when it is created.
Please give us a heads up if it isn't. (Just write something like: Do not merge yet.)
If you wrote that it is not ready yet you need to tell us that it is ready now. (Example by writing ready for review.)
Assigning a pull request means this moderator will be responsible for periodically checking back with the pull request. (Sometimes life gets in the way though. I for example currently have exactly 0 time to check the pull requests assigned to me. I will have this problem for another week.)