I completely agree with @Zanna's answer and rejection reason for your edit (I also rejected the edit for the same reason).
I would like to make clear, though, that the reason why you got the message "You have too many pending edits" is not that the Suggested edits review queue is full. It's almost empty right now actually and in quite good shape in terms of edits waiting for review.
The real reason that you got the message is because a user with less than 2000 rep (i.e. without editing privileges) can only suggest up to 5 edits at any given time. So, if you have 5 edits pending review and try to suggest another one, you will get the message. If then one of your suggested edits gets reviewed, you will be able to suggest another edit, but if you try to suggest one more you will get the same message again, because your pending edits are already 5. In other words, it's like a personal queue, unrelated to the number of posts waiting for review in the Suggested edits queue.
Finally, keep in mind that the reason for some delays in reviews of suggested edits can be attributed to the time difference, which is of course related to the fact that not many people participate in the review queues.