Wales finished a first season under Tandy with a record of three wins, against Japan, Italy and Fiji, from 12 Tests.
They are 11th in the world rankings – bizarrely moving up a place courtesy of the Azzurri’s heavy loss in Australia – as they count down to next year’s World Cup, when they face England, Tonga and Zimbabwe in the group stages.
“The squad has developed, particularly with our performances against Scotland and Ireland during the Six Nations, and then the win over Italy,” said Morgan.
“We were pleased with the victory over Fiji at the start of the summer as well because we know how difficult they are to beat.
“We just have to keep developing and we’ve been doing that as a squad. There are still plenty of lessons to learn, but the more we play together, the more experience we gain and the more we can improve.”
Morgan, who is now officially a Gloucester player after his summer move from Ospreys, missed eight Tests after suffering a shoulder injury against Argentina in Tandy’s first game.
The British and Irish Lions flanker says that Wales are leaving no stone unturned in their bid to close the gap as quickly as possible.
“We’re a very close group and everyone wants to get better,” said Morgan, who was captain for Tandy’s first game.
“I’m proud of the effort they’ve put in, not just over these last three weeks but throughout the whole season.
“It’s clear that everyone wants to learn, improve and continue developing together as a squad.”
Wales play four Nations Championship fixtures in November against Japan, New Zealand and Australia in Cardiff before facing another southern hemisphere opponent at finals weekend in Twickenham.