Yes, Smartron SRT Phone does have the LED notification light.
Yes, Smartron has already announced that they are going to release Android Oreo update for SRT Phone customers in January 2018.
Yes, Smartron SRT Phone does support Jio video calling. SRT Phone is a true 4G VoLTE mobile phone.
Yes, Smartron SRT Phone does have the fingerprint scanner.
Yes, you can record 4K videos on Smartron SRT Phone.