https://thehill.com/regulation/court-battles/430533-ginsburg-returns-to-supreme-court-for-oral-arguments claimed: "The Supreme Court's Public Information Office confirmed Ginsburg's attendance shortly after 9 a.m.". But I found no public statement like that. Maybe they asked that but this is not an official public statement.

So I looked for official statements about RBG.

The main site of the SC ist this: https://www.supremecourt.gov/

Case for argument today: https://www.supremecourt.gov/oral_arguments/daycall/DayCall_02-19-19.pdf

It's 1 hour

Transcripts:

Transcripts are posted on the Court’s website on the same day oral arguments are heard, usually about 90 minutes after an argument has concluded: http://www.supremecourt.gov/oral_arguments/argument_transcripts.aspx.

The transcript site shows an error now but will be hopefully updated today.

Previous transcripts: https://www.supremecourt.gov/oral_arguments/argument_transcript/2018

Hearing list Feb 2019: https://www.supremecourt.gov/oral_arguments/hearinglists/HearingList-Febuary2019.pdf

All oral arguments are open to the public, but seating is limited and on a first-come, first-seated basis. Before a session begins, two lines form on the plaza in front of the building. https://www.supremecourt.gov/oral_arguments/courtroomseating.aspx

Press releases: https://www.supremecourt.gov/publicinfo/press/pressreleases.aspx

Latest release is from Dec, 21 on RBG and ends with "Updates will be provided as they become available." But there are no updates until now.