Provisioning time depends on the specific service, hardware availability, and any setup steps required before the system is ready for use. Some orders are prepared quickly, while others may take longer based on the queue and deployment process.
Treat the active service status and access details in your account as the confirmation that the Mac is ready. Do not assume it is available until you have the information required to connect.
If your project is time-sensitive, build in a little deployment buffer instead of assuming the shortest possible turnaround.