Tsunade will still be far below Minato's level despite the addition of FTG to her arsenal.
Firstly, having Minato's technique (FTG) =/= using it on Minato's level. Her reflexes and attack speed are going to be nothing like Minato, not even close. Her Shunshin is not even existent, let alone comparable to Minato's exceptional one. And I highly doubt even her utilization of that technique itself will be as commendable like a genius like Minato i.e. the accurate timing and knowing when to do what. And neither do I believe it will be so versatile like having all FTG variants.
Conclusively, talking just about FTG, she'll definitely be a tier below Minato. But in the overall factor of speed, she'll be far from Minato's level, not even close, despite FTG. Minato >> Tsunade (FTG) in speed.
Her super strength might balance (I think she'll still trail) Minato's paramount advantage in speed. Add medical ninjutsu to that, and she pulls ahead of Minato. But then again, Minato's sensing abilities, Uzumaki seals, Ninjutsu and Sage Mode will FAR outweigh anything Tsunade has.
Minato easily takes this. Tsunade won't be able to come close to Minato despite FTG.