Time DOES fly while you're having fun, but...
You used approximately ZERO of your subscription months while you explored and tested out the beta.
Once those three elements have been fulfilled, as backers, if you select a language that has been marked as released, your time starts regardless of if your language is waiting there or not. Therefore, if your language isn’t ready, you will need to NOT select a released, full language (i.e. select a language that is still in beta).
Keep an eye on progress.fluent-forever.com for updates and information.