After rain, wind and lightning led to two suspensions on Friday, the weather was sunny but windy for the third round.
Tee times have been moved up for Sunday, however, with more inclement weather in the forecast.
Thomas, who hasn't had a bogey this week, said he wouldn't be focused on keeping that streak alive in the final round.
"Overall bogeys are going to happen," said Thomas, who won the CJ Cup at Nine Bridges back in October and the Tournament of Champions in January before the tour halted play in March in the midst of the coronavirus pandemic.
"I'm just going to go out there and keep executing my game plan. I'm not trying to not make a bogey. I'm stepping on the tee trying to hit the fairway, trying to make birdie. If you're out of position, then you try to make a par."
Hovland is seeking his second US tour title this season, having gained his maiden win at the Puerto Rico Open in February.
His six-under effort was powered by his length off the tee.
"Out here driving is very important," he said. "I've kind of been spraying a couple out to the right so if I can keep them a little straighter tomorrow I'm going to give myself a lot of birdie looks."
Leading third-round scores on Saturday in the US PGA Tour Workday Charity Open at Muirfield Village in Dublin, Ohio (USA unless noted, par-72):
200 - Justin Thomas 68-66-66
202 - Viktor Hovland (NOR) 69-67-66
203 - Collin Morikawa 65-66-72
205 - Sam Burns 69-66-70, Kevin Streelman 70-64-71
206 - Ian Poulter (ENG) 68-69-69, Rory Sabbatini (SVK) 69-68-69
207 - Gary Woodland 73-68-66, Rickie Fowler 72-69-66, Chase Seiffert 68-69-70, Hideki Matsuyama (JPN) 67-68-72, MJ Daffue (RSA) 73-69-65
208 - Matt Jones (AUS) 69-72-67, Troy Merritt 69-72-67, Sepp Straka (AUT) 69-70-69, Xander Schauffele 69-73-66, Sam Ryder 70-72-66
209 - Stewart Cink 72-69-68