It’s not easy working full-time and writing a dissertation. A few fortunate doctoral students can quit work and devote themselves completely to the dissertation. But if you cannot quit, you can still make time for it—by meeting with your employer or supervisor.
Employers often encourage higher degrees, and some pay for them in whole or part. Your boss may be supportive of your academic pursuit and willing to give you released time and preferential schedules to meet the demands of graduate work. To gain what you need, you need a plan and rehearsal for the talk.