In London on Tuesday, the World’s Best will be announced with Winx favoured to take the Turf title but up against Dubai World Cup winner Arrogate for the top award.
The committee which decides the ratings has re-assessed 2017 but in the last rankings Arrogate was on 134 and Winx on 132.
English horses, Champion Stakes winner Cracksman and Arc winner Enable may also challenge if their respective 130 and 128 rankings have been revised.
No matter what happens, Waller is feeling less pressure going into the autumn than he did a few months ago when he was preparing Winx for the Cox Plate.
And he and her owners are no closer to a decision on an overseas campaign.
“I expect her to finish midfield in the trial,” Waller said.
“She has come back well. She is fit and sound but we are all aware she is in the twilight of her career.
“I actually feel the most relaxed I have felt for a long time training her.
“Maybe it is because the third Cox Plate is out of the way.”
While Winx is preparing for what might be her final campaign, the trainer is excited about the future for Performer who also runs in a trial on Monday.
The winner of the Breeders’ Plate in October, Performer is the favourite for the Golden Slipper in March.
Waller said the two-year-old colt had strengthened since his win.
“He has put on about 40 kilos. We are expecting him to trial well again and go to the Canonbury Stakes in a couple of weeks,” he said.