Congratulations, looks good so far but I agree you can celebrate till after the second flush as the scions sometimes dies back. Grafting is addictive, especially after your first success. Sauam256 has a great selection of scions and always sends excellent quality material. Make sure not to let the scion hold Fruit for at least one year. We’re not like in Florida, if you let it hold Fruit this Spring, the scion can die back even after the second flush.
Simon