NRI buying apartment near Financial District — RERA & legal tips needed

I am currently based out of the US and planning to purchase a 3BHK apartment in the Financial District belt for our eventual return to India. My budget is flexible for a premium project, but having been burned once by a severe project delay back in 2023, I want to be extremely careful with legal compliance and timeline reliability this time. I am looking closely at high-rises near Nanakramguda and Gachibowli extension. Could someone guide me on how to thoroughly vet a project through the TG-RERA portal from overseas? Apart from just checking the registration number, what specific red flags should I look for in the Quarterly Progress Reports (QPR) or the promoter's litigation history? Also, which major developers in this specific zone have the cleanest track record for delivering handovers exactly on schedule? Any advice or legal checklists from fellow NRIs who closed a property here recently would be incredibly helpful.