Phase 3 details for golf have been posted on Mass.gov: https://www.mass.gov/info-details/safety-standards-and-checklist-golf-facilities
The Phase 3 workplace safety standards for Golf Facilities are posted in advance of the Governor’s initiation of Phase 3 to allow Golf Facilities time to prepare to operate in compliance with these mandatory health and safety standards. Golf Facilities may not expand operations beyond what is currently permitted in Phase 2 until specifically authorized to do so in Phase 3 of the Commonwealth’s Workplace Re-Opening Plan. The Governor will initiate Phase 3 of the Re-Opening Plan, which will commence on July 6, by formal Executive Order following a careful review of public health data.
Phase 3 Workplace Safety Standards for Golf Facilities: https://www.mass.gov/doc/sector-specific-workplace-safety-standards-phase-iii-step-1-for-golf-facilities-to-address/download
Phase 3 Protocol Summary for Golf Facilities: https://www.mass.gov/doc/phase-iii-step-1-golf-facilities-protocol-summary/download
Phase 3 Checklist for Golf Facilities: https://www.mass.gov/doc/phase-iii-step-1-golf-facilities-checklist/download