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We see Shigaraki's hand being 2cm away from Deku's face, then the gunshot. Shigaraki can react at fte speeds, even if Deku slowed down.He means that Deku is still moving towards Shigaraki's hand at a really high but unknown speed while Shigaraki's hand is also moving towards him at FTE speeds, while Snipe's bullet had to travel hundreds of meters before Shigaraki touched Deku's head.
This next bit is pure guess work, but assuming Deku's head is 50 centimeters away from Shigaraki's hand at the time Snipe fires his bullet, and assuming both are moving at FTE speeds (34.3 meters per second), the timeframe would be 0.0072 seconds.
Snipe's bullet had to travel hundreds of meters before this timeframe is completed or else Deku gets decayed, meaning:
Bullet Speed = 100 meters (low-balled distance)/0.0072 seconds = 13888.88 m/s or Mach 40.49
Now people could say that Deku simply slowed down after jumping and wasn't moving as quick (it doesn't make sense for Shigaraki to be able to intercept a Deku jumping at 100% after all) or that Snipe somehow predicted where Shigaraki's hand would pop out of Kurogiri's black mist and fired the bullet before his hand came out, but that's really unlikely.