MLBTR’s 2021 arbitration tracker is available here. The tracker is regularly updated and allows for filtering by team, signing status, service time, and whether the player had a hearing.
This year, the date to exchange figures for unsigned arbitration eligible players is Friday, January 15th. Most teams, if they reach the point of exchanging figures, will not have further negotiations for a one-year deal and will go to a hearing. This has resulted in an increased number of hearings, about 13 per year on average since 2015. Over the past decade teams have won 46 hearings, while players have won 44.
With the 60-game season in 2020 and no agreement on how that affects arbitration, the players that have made it this far without a contract are in uncharted waters. At present, more than 120 arbitration eligible players are without contracts, including Francisco Lindor, Corey Seager, Cody Bellinger, Kris Bryant, Walker Buehler, Josh Hader, and Juan Soto. The record number of arbitration hearings was set in 1986, with 35.