Show my plugin window on top of editor when a new uproject is finished loading

What Delegate should I use in my plugin to ensure that my Slate window appears on top immediately after the .uproject is loaded in Unreal Editor? The trick is I only want to have this happen once, on uproject load.

I’ve been trying to ensure my plugin’s custom Slate window shows on top as soon as the .uproject is fully loaded and visible, but none of the following approaches have worked: PostEngineInit, FEditorDelegates::OnEditorInitialized and FEditorDelegates::OnMapOpened but they are all early and my window shows up behind the editor.

Thanks,
st