Can we take it from the graphic that the 'toast rack' will be complete before (or alongside) R3? That's a lot of building work...
No, we can't.
The current proposals show around 10 years' worth of terminal construction in the years after R3 would become operational:
Runway operational (2025)
T6A Phase 1 (J) (2026)
T6B Phase 1 (K) (2026)
T6A Phase 2 (J) (2027)
T6B Phase 2 (K) (2027)
T2A Phase 2 (C) (2032)
T2E (D) (2033)
T2D (E) (2034)
T2A Phase 3 (C) (2036)
T2C (A) (2036)
The letters A to J indicate the elements of the "toast-rack" (terminals and satellites) in order reading east to west. K is the T6 satellite adjacent to R3.
Also, is the new R3 pier served by a new T6? The building just west of T5?
Yes, that's the plan.