contract status ENUMs

Hi,

Could you please explain the contractStatus ENUMS? Especially, the difference between PRE_DELIVERING and DELIVERING? https://binance-docs.github.io/apidocs/delivery/en/#public-endpoints-info

For example, EOSUSD_210625 is available via API and its contract status is DELIVERING.

Both mean not tradable yet. You can only focus on the “TRADING” symbol

Thanks @MJW, what is the difference between PRE_DELIVERING and DELIVERING?