Excellent!
Because there are only 128 steps in the OSCCAL value 1, in the worst case, you call not be able to get better than 1/128*100 = 0.78% 2. The goal is ±1%. Anything better than that is just good luck.
1 Tiny Tuner 2 uses the full range; 256 values.
2 The actual value is a bit lower because the relationship between OSCCAL and the frequency is not linear.