The Ganesh Chaturthi 2018 Puja Muhurut to bring the Vigraha / Idol home is during the Shubh, Labh or Amrit Choghadiya. If you intend to bring Ganpati ji one day before, i.e. on the 12th September 2018, the Shubh time is between 11:03 to 12:35 and the Labh time is 17:09 to 18:40. Ganpati ji can also be brought home (Avahana or Welcome) during the Amrit time which is between 15:37 to 17:09. The Muhurut for evening time would be the Shubh time which is between 20:09 to 23:06. Please note these Timings are as per panchang of Mumbai, India.
The Ganesh Staphna (installation of the Idol) on Ganesh Chaturthi day, i.e. on 13th September 2018 can be done at Shubh time between 06:29 to 08:00 or Labh Time i.e. between 12:34 to 14:06. Ganesh Pooja is preferred during Madhyanhana on Ganesh Chaturthi as it is believed that Lord Ganesh was born during Madhyahana Kaal which is between 14:06 and 15:37. The Muhurut time specified above is the best Muhurut to perform the Ganesh Puja and to perform any work.