Nawada Extension mein Metro Phase IV ka kya scene hai?

Budget for a 3BHK in Nawada Extension finalised, but the builder is really testing my patience with these infrastructure delays. Currently in a 2BHK, I'm thinking of upgrading, but this project was promised big gains from Metro Phase IV and UER-II connectivity. Builder ne bola tha ki possession tak kaafi kaam ho jaayega, par abhi tak toh kuchh khaas progress nahi dikh raha. Is the promised completion of Metro Phase IV near Nawada Extension realistic? Matlab, bahut wait kar rahe hain is connectivity ke liye. Is the price jump worth it if these infra projects keep getting delayed? Already have a home loan running, don't want to regret this move. Anyone else facing similar issues with builders promising connectivity near upcoming infra? What did you guys do?