Yes, there was a significant backlog, however that logjam is getting much better. That said, I've seen a number of solid applications floating around, so I think you better get yours in the moment the Chief of Recruiting says to do it. It used to be you submitted the app no earlier than 12-14 months from a potential PCS, but you'll need to call and see what the latest is.
DSN 368.4447 and speak to Maj Lang. I recommend emailing him also if your call goes to voicemail. He has been in that seat a while and is moving on very shortly. Not sure who will replace him, but the phone number is