It has been announced that the State Opening of a new session of Parliament will be on 10 May 2021 -
State Opening of Parliament: May 2022 - GOV.UK (www.gov.uk)
The present session will be prorogued probably at the end of April. As the current session has lasted more than 6 months the provisions of s 2 of the House of Lords Reform Act 2014 may be triggered in the case of a peer (not on leave of absence or otherwise disqualified/suspended) who has not attended a sitting of the House during the session. Such a peer ceases to be a member of the House of Lords unless the House votes otherwise.
According to my records peers who may currently be at risk of expulsion for non-attendance are:
Lord Archer of Weston-super-Mare (NA)
Lord Carter of Barnes (NA)
Lord Dear (XB)
Lord Kinnock (Lab)
Lord Moonie (NA)
Baroness O'Neill of Bengarve (XB)
Lord Oxburgh (XB)
Lord Stevens of Ludgate (Ind Con)
Lord Young of Graffham (Con)
I should stress these are based on records publicly available. I have checked the voting and speaking records of each peer on Hansard via the Parliament website and also the members' allowances records which are available until October 2021 which include records of attendance even when a peer has not claimed an allowance. It is quite possible (though perhaps unlikely for all of them) that those of the above peers who have taken the oath may have attended the House since October but have not voted or spoken.