Flow Country (UK)
seems probable for 2023 based on this report. Two years from January 2020 would mean the official submission timetable is January 2022, which would mean a formal evaluation and decision by the world heritage committee in 2023.
"The Department for Digital, Culture, Media and Sport will assess our technical evaluation in mid-January, before deciding whether or not we can proceed to stage two which involves a full nomination document going to Unesco [the United Nations Educational, Scientific and Cultural Organization] in 18 to 24 months' time."https://www.johnogroat-journal.co.uk/news/another-step-forward-for-flow-country-world-heritage-bid-188699/