The House was back in session on Jan. 5, don’t know what day the Senate resumed but you’re right, all this negotiating between the two have been in secret meetings without Repubs present.
This week they apparently don't convene until Tuesday afternoon. The Senate goes back in session on Wednesday.
Also found this page, which lists for each session the days each body was in session. For the Senate is was only on the 5th. The House was in session on the 5th, the 12th, the 13th and the 15th (Tues, Wend and Fri of last week).
But, of course, there is NOTHING in the daily digests of Congress about meeting with the President or reconciling health care, or reconciling any legislation. IOW, that is ALL being done extra-legally. (I'm aware you're not disagreeing with me on that obvious point.)