Delta has taken over the T3 lounge space and is operating a Skyclub from there.

You check in with VA in T2 (at the west end of the counters).

The flight will depart from TBIT; you can take an airside bus from T2/T3 to TBIT.

Not certain about your circumstances for lounge access but I'm pretty sure that if in Business class on a VA flight number you can get to use the EY lounge at TBIT.