No, there is no such indicator.
Count the questions manually (they are listed per 30 on your questions page), and add 30 days to the oldest question. Take into account any you deleted recently (there is a link at the bottom of the questions page, listing questions you deleted in the past 60 days).
The posting timestamp of question #50 + 30 days is the moment you can ask again.
If you didn't delete any questions, by my reckoning question #50 was posted on October 7th, at 18:06, which means you must've deleted at least one question to be still rate limited. The next one was posted on October 13th, at 23:50 UTC, meaning that if you deleted just one question in the past 30 days, you should be able to ask a question again on November 13th (give or take 10 minutes).