Harden was placed on the disabled list by the Rangers on Sunday with right shoulder tendinitis.
"He did a great job last night," Jones said. "His change-up especially was fantastic.
"If he's not there, he's definitely close."
In his last rehab outing with the RedHawks, Harden had a brilliant start. He struck out 10 in six innings on July 26 at Memphis. Harden carried that through with the Rangers, allowing one run in seven innings against the Angels on July 31.
But then he struggled in his next start and quickly found himself back on the disabled list.
Brown breaks out
Matt Brown has gone from hot to cold in the last couple of weeks.
After going 2 for 4 with a double, triple and an RBI on Thursday vs. Reno, Brown said he hopes he can get hot again.
Before the RedHawks left for a road trip that started Aug. 4, there was no hitter on the RedHawks as locked in as Brown.
But in his last 11 games, Brown was just 4 for 42 (. 092).
Wednesday, Jones bumped Brown down in the order and, after an 0 for 4 night, Brown was hitting sixth again Thursday.
"He's just not seeing the ball real well right now," Jones said before Thursday's game. "That's usually what happens when you hit a slump. But we're going to keep him in the lineup, and he'll break out of it eventually."
Colome makes debut
After being unavailable for his first couple days with the team, newly signed Jesus Colome made his RedHawks debut Thursday.
The 32-year-old right-hander pitched a scoreless eighth inning, striking out one.
Colome was available for the first time Wednesday night, but he was not needed after Harden and Warner Madrigal went the distance.
Colome hadn't appeared in a game since being released by Albuquerque on July 3.
Reno (RH Bryan Augenstein, 5-7, 6.68) at RedHawks (RH Brandon McCarthy, 2-0, 2.48), 7:05 p.m. Friday