DIRECT ANSWER
Professional Ship Simulator is scheduled to enter Steam Early Access on September 16, 2026 for Windows PC.
Confirmed timing
The developer and Steam list September 16, 2026. The exact unlock hour and price are not announced in the sources checked here.
Launch foundation
Two large scenery areas, eight mission types, and initial scenarios and tutorials are described for Early Access. Development is planned to continue to approximately mid-2027, depending on feedback.