Interviewing while on Maternity Leave. Do you tell the recruiter you're currently on leave? [MN]

I just had a baby and I'm currently on maternity leave (FMLA) from my job (1.0 FTE, salaried).

I came across a job listing at a previous employer of mine (from five or so years ago) that I was interested in and applied. It's a nice jump from my current position and is still in the same industry. Benefits are it's a 15k salary increase, closer to home and has cheaper/better ins policies. My cousin currently works for this employer and has shared the benefits information with me.

I'm wondering if I should mention to the employer that I'm currently on maternity leave? I'm on leave and am set to go back to work the first week of April. I'm assuming the new employer will want me to start sooner than April if an offer is extended. As a recruiter or hiring manager, have you come across a similar situation with candidates before, and what were the compromises/decisions if you wanted to extend an offer? TIA!