You must be working here for 6 months before you get benefits, are you okay with that?

Only you know your current situation, and sometimes having a job without benefits for 6 months is okay. Candidly tell the interviewer if you are okay with this understanding that if you say no you will no longer be considered for the job.

Keep in mind that you may be able to purchase a short-term benefit plan online to cover any gaps you may have until benefits with a new company kick in.