After pleading not guilty to a charge of affray last week, Stokes has been released on bail and his case sent to Bristol Crown Court, with the first hearing - which he is not required to attend - scheduled for March 12, allowing him to resume his global career.
"He looks in great nick, he's hit the ground running since he's been involved and he's been himself, which is great to see", Morgan told reporters in Hamilton ahead of the opener of the five-match series at Seddon Park Sunday.
Stokes had been kept out of the England team due to his involvement in a late night brawl outside a Bristol pub in September.
Along with Stokes, Joe Root, Moeen Ali, Chris Woakes and Jonny Bairstow have also returned in the England squad after missing the recent tri-nations T20I series, in which Australia beat New Zealand in the final.More news: Teen Burnt To Death Outside Her Village
England's limited-over captain Eoin Morgan, however, said the 26-year-old had been looking good in the nets since joining the team and would not take too much time to get back into form.
"England are one of the best sides in one-day cricket at the moment, having just played against a strong Australian side and been so successful".
"It's a skill of any professional sportsman, or any professional when it comes down to doing your job, and it's actually a nice release because you get to focus on one thing".
We know it's a tough challenge against England.More news: 5 arrested at Stockton high school anti-gun walkouts
"They are very aggressive with the bat, and their balance is one of their biggest strengths with the number of all-rounders".
New Zealand were runners up at the last World Cup, a tournament where England bowed out early prompting a massive shift in thinking within the camp and something of a ODI revolution led by the rise of some dynamic white-ball specialists.
Morgan said that despite winning the 50-overs series in Australia, his side had struggled with the bat and would need to improve in New Zealand conditions. "Our bowling has come a long way in the last eight months, 11 months probably".
"There were incidences off the field (in Australia) which obviously didn't help us and distracted a little bit from our cricket, especially for people watching back home", he said.More news: Theis' career night helps push Celtics past Pistons
Root continued: "You know in Australia, it's a very hard place to go and win and you're going to have to be at your best throughout the whole tour".