Do I have to bring kids with me right away?

I am moving to SZ next month, and given that I am new to the country I am thinking about arriving alone.

If we all got visa authorizations and D visas, is it ok if I am the only one registered initially (within 14 days)?

They would join me in a few months.

When you get issued your D visa, it has an expiry date, they need to come before they expire.