They have always had full time security at their homes. Garland simply appointed US Marshals to provide extra protection, alongside the Supreme Court police who typically provide protection for them.

Having security people patrolling the outside of the house is not the only way to protect people. It's simply a more visible way.

Unless members of their immediate family are living with them, they are NOT currently getting protection. That's why you're seeing stories in the news about the bill, the Supreme Court Police Parity Act, being held up in the House by Democrats. It was introduced by a Republican and passed the Senate vote, but now it's being stalled in the House.