Mostert sustained a broken left leg and fractured wrist in a 50g crash during qualifying for this year's Great Race. Those injuries, plus a second surgery to repair damage to his left knee, meant he had remained at Orange Health Service Hospital since the accident.
Veteran racer Russell Ingall will take his place alongside Cameron Waters at the Castrol Gold Coast 600 this weekend, switching from red to blue during the week.
The 2014 Supercheap Auto Bathurst 1000 winner is in high spirits now he has moved back to his home state and is looking forward to watching this weekend's Castrol Gold Coast 600 from his hospital bed.
"I will watch as many sessions as I can this weekend and am super-pumped to watch Russell in my car," Mostert said.
"I've learnt a lot racing around him; he races hard, so what better person to fill in for me and back Cam up. I think they have a good shot and I am just happy that Russell has been able to step up and do it for us.
"I wish both of them all the luck this weekend and want them to bring a surfboard trophy back so I can get some rehab going in the surf!"
After an outpouring of support, Mostert thanked his fans and everyone involved in his recovery.
"I am overwhelmed by the support from the V8 Supercars community - other teams, legends of the sport and fans. I didn't realise how wide our sport reached and how much care there is. Every bit of support helps with my healing process and I am looking forward to getting fit and getting back in the car next season."
Waters will replace Mostert in the two final sprint rounds at Auckland and Phillip Island, while a sub for final SuperStreet event the Coates Hire Sydney 500, is still to be determined.