How should I answer “When can you join?

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Hi everyone,

I’m currently working in the marketing sector, but I’m not really satisfied with my current company. So I’m looking for a better opportunity where I can grow my career.

The thing is, I haven’t resigned from my current company yet. We have a 30-day notice period, starting from the day I submit my resignation.

I’m a little confused about what to say if an interviewer asks, “When can you join?”

I was thinking of saying something like:

If I’m selected, I’ll submit my resignation to my current company and complete the 30-day notice period. After that, I’ll be able to join.

Would that be okay to say during an interview? Would employers generally take it positively?

I’m also thinking about the joining date because companies often hire people at the beginning of the month. So I’m not sure how I should communicate my availability.

Would appreciate some advice from people who have been through a similar situation or have experience with hiring.