According to MS Dynamic World:
Microsoft will stop selling new perpetual licenses for new customers of Dynamics 365 Business Central on-premises and Dynamics GP in October 2025. And the sale of new Dynamics GP subscription licenses for new customers will end in October 2026.
These decisions do not impact the ability of existing customers of GP and BC on-prem to run their systems, add users, or license capabilities. And Business Central on-premises sales will continue via subscription-based licensing. But the change effectively sets an end date for new customer sales of GP.
Via: MS Dynamics World