Depends on the year:
24.75 lb Stock Supra TT front wheel (93-97) 17x8
23.60 lb Stock Supra TT front wheel (98) 17x8
26.55 lb Stock Supra TT rear wheel (93-97) 17x9.5
25.40 lb Stock Supra TT rear wheel (98) 17x9.5
Some ideas of what they weigh with tires:
46.00 lb Stock Supra TT front wheel (93-97) with bald tire
49.50 lb Stock Supra TT rear wheel (93-97) with bald tire
54.50 lb Stock Supra TT rear wheel (93-97) with new S03 (265/40/17)