More than 65M absentee ballots have been cast as of Tuesday out of nearly 101M total votes in the US. Over 27M absentee ballots remain outstanding. Voters have an option to check the status of their mail-in ballots. As an example, Washington offers an online ballot tracking system at https://voter.votewa.gov/WhereToVote.aspx. The links provided carry a list of sites to check the same.