The information has certainly not escaped you: the Federal Minister of Energy Tinne Van Der Straeten has announced that the schedule for the conversion from lean gas to rich gas has been maximised.
The last municipalities will switch to rich gas by 2024 at the latest. The next conversions are scheduled for 1 June 2021 and 2022 and the main municipalities or parts of municipalities* concerned are :
More information can be found on the website of the relevant network operator:
Sibelga : https://legazchange.brussels