Any delay in the results from Maine’s Senate race will be because the race is close between the two front-runners. Just like any other tight race, it takes time to know the outcome, and the goal is accuracy. https://apnews.com/article/election-2020-donald-trump-matthew-dunlap-elections-voting-2020-e6974cb162dd713b9c8b15278466fe0e
While there’s an understandable instinct to blame a reform like #rankedchoicevoting, this year is all about ensuring all voters are heard, and that will take time.
In the meantime, @FairVote will have final-round projections for any Maine election that needs multiple rounds of tabulation. Ranked choice polling lets us reliably project outcomes, even in close races. Check out http://fairvote.org/election_results_hq after first-round results are in!