It always puts a fire under a hiring manager if they are aware that you are actively looking for a new position, especially if there is any sort of timeline you're under. They are also curious about where they scale on your job wishlist, as they ideally want to hire those who want to work for them over their competition. Feel free to talk with the interviewer about your search so far, volunteering only what makes you comfortable, without oversharing.

Job hunting is a numbers game. They don't expect you to put all your eggs in one basket. But they also don't want to hire someone who is just looking for any job. Keep an organized folder with every customized resume and cover letter you've submitted to each position you are interviewing for. The interviewer will have something similar for all the applicants they are interviewing. Have tabs separating your notes for each interview, with a breakdown of the pro and cons of each employer. Detail, for your eyes only, what each of them offers you and what you offer them. Having this with you will exude yourself as an organized professional, taking all your prospects seriously. This will help market you as a viable candidate.