Permits will be in place for residents
Update: Residents along the border will be able to apply for permits from tomorrow through Service NSW.
NSW Police Commissioner Mick Fuller said the initial closure is expected to cause delays.
"In the first 72 from midnight Tuesday this week, it will be difficult ... to make that crossing. There will be delays whilst we work through who are essential work.
"We have learnt lessons from QLD and SA. Services NSW, by tomorrow, will have an online application for an exemption."
CP Fuller said the task required multiple agencies to work together.
"We know there are four primary road crossings, 33 bridges, two waterway crossings and multiple smaller roads. The task is not lost on me in terms of the enormity of the logistics in this operation alone.
"There are 11 local government areas, five police districts that will all have to pull together to make this operation a success."
NSW Chief Health Officer Dr Kerry Chant said people returning to NSW from a Covid hotspot are required to self-isolate.
"We think [the border closure] is a prudent and precautionary approach," Dr Chant said.
"Based on the fact that we have seen increasing cases extending outside the hotspot areas, and recognising there is often a lag between when cases are recognised and diagnosed, we felt we needed to get ahead of the potential spread to safegaurd the seeding of NSW."