We've submitted a channel update on October 27 2017, with modifications for the new Scene Graph requirements, but until now the Roku page says "Your channel has been submitted for publishing and is being reviewed."
We're worried about the waiting time. Is that normal?
Another thing that is worrying us is that in the Static Analysis there is 1 ERROR: Package includes __MACOSX directory.
Is that really a problem that would lead to rejection of the channel update?
No, this is not normal. Please email partnerSuccess at roku.com promptly. Something has gone wrong (you did not receive feedback email?!) and i am fairly sure you won't hear back till you pursue this proactively. My general recommendation is, if you don't hear from us in a week, follow up through partnerSuccess.