The Department of Labor, including OSHA, has issued its Spring 2019 Regulatory Agenda. Federal agencies post their regulatory agendas on the Reginfo.gov website twice a year to provide a snapshot of their rulemaking priorities.
A listing of Department of Labor (including OSHA) rulemaking in the pre-rule, proposed rule, and final rule stages is available here. Rules that are classified as long-term actions are listed here.