For global aspect : 

https://mobilite-mobiliteit.brussels/fr/projets/amenagement-du-tunnel-thomas-de-la-rue-du-progres-et-de-lavenue-de-la-reine

"Les tunnels Thomas et Reine sont donc exclusivement destinés au trafic des transports en commun, mode doux et services d’urgence (Reine). Les voies du tram dans le tunnel Thomas seront déplacées." Some other mesure are also descibed (to check)

Pratical view :

1 :  Works are supposed to finish soon but are delayed due of some incivility and security problem.
2 : Signage is a mess ; i have talked about each signs with a policeman this morning : D10 are not correct ; the only part that is not segrated is https://www.openstreetmap.org/way/371914172 others are mostly segraged under the tunnels , not on the crossing parts ... M2 are confusing but for him depending of the situation it can be interpeted as bicycle allowed ... (sure if i asked another the interpretation will be different ...) 

3) near position of the pin : https://www.mapillary.com/app/?pKey=1520667101999213 no bicycle allowed on tram track. 

Comming from the north it's more confusing : https://www.mapillary.com/app/?pKey=358598547151816 

From the north The only reason to use the tram track will be to go on Rue de Cologne, but i don't think it's necessary https://www.mapillary.com/app/?pKey=1105640307225831 (can use the cycle trafic light or use the footway crossing for these case).

