Metop-SG direct broadcast software
For Metop-SG direct broadcast, the conversion from raw (VCDU) to level 1b (or 1c in the case of IASI-NG) will be performed by software that is being procured by EUMETSAT and will be distributed by the NWP SAF.
Many of the details are discussed in EUMETSAT’s Metop-SG Direct Readout Guide and in the three documents linked from the bottom of that page.
Two-line elements for Metop-SG A1 are available from EUMETSAT’s TLE page.
Here is an extract from an ITSC-25 poster (6p.02) by Booton et al., explaining the status as of May 2025:

We will provide further information here when the packages are released.
Update: it is planned that the packages will be released to users in early April 2026.