Contractors yesterday hoisted the fourth giant steel truss into position to span the stadium's playing area, leaving just one truss to be assembled and installed in December, he said.
The fourth truss - weighing 110 tonnes and measuring 105m long - was moved into position on Tuesday and lifted yesterday, Mr Farry said.
At the same time, installation of the stadium's ETFE roofing material was continuing.
The material was now in place up to the third truss, albeit with some infill panels still to be added.
The sections of ETFE were being inflated as work continued, and the entire roof was on schedule to be completed by early next year, Mr Farry said.
"It gives a feel of the stadium as it starts to be enclosed.
"The feel will be much more like a stadium when the east and west ends goes up, because it's then a completely surrounded pitch, and, of course, when the seating goes in," he said.
Work to install the venue's seating was expected to begin late next month or in December, he said.
Work inside the stadium was also continuing, with internal walls going up and being lined, services installed and connected, ceilings being added and glass going in, he said.
"The kind of stuff that's happening is the kind of stuff that happens in a house ... particular areas are starting to look and feel like ... rooms."
