14 days out is too much time to have a lot of confidence that the numbers will stay like that. Also, keep in mind that R0 means you have no view into the upgrade waitlist length ... there could be 10 other people on the list already. As an SE you'll be in OK shape, but you're behind any SEMM's.

Bottom line ... you might be OK, J9 is better than J0 but I've seen loads swing quite a lot in the last few days before a flight.