National Farmer's Federation (NFF) spokesperson Brett Heffernan said the telco has since rectified most of the problems that held off the CDMA closure.
"The systemic problems that we saw earlier this year have dissipated and we are comfortable with the closure of CDMA," Heffernan said.
"Next-G had all sorts of problems, but we're hearing Telstra is active on the ground and has fixed the problems.
"There still are individual farmers who have isolated problems, not all necessarily related to the network, and our push to Telstra is to rectify those problems."
Heffernan said most regional and rural CDMA users have switched to Next-G.
The NFF issued a joint report to the Department of Broadband, Communications and the Digital Economy (DBCDE) prior to the initial CDMA closure which found 73 percent of regional Next-G subscribers had serious problems with the network.
Heffernan said the report helped sway Conroy's decision to withhold the network closure.
Telstra country wide director Gary Goldsworthy said the network will be shutdown at midnight AEST.
"We have prepared for the closure of the CDMA network for more than two years and nothing has been left to chance," Goldsworthy said.
"Today really is the last chance for remaining CDMA customers to move across to a new mobile network and remain connected."
The telco will deactivate some 3500 CDMA sites around the country following the closure, and will remove additional redundant equipment.
The closure will start in the eastern states and sweep across other regions in accordance with local time zones.
Calls will flow over the deadline will be allowed to continue until 1AM tomorrow.
The CDMA network held almost two million regional subscribers at its peak, according to Telstra.