https://en.wikipedia.org/wiki/Tyrannosaurus#:~:text=This%20is%20approximately%205%E2%80%937,by%20characters%20of%20the%20skull.

Tyrannosaurus - Wikipediaen.wikipedia.org

https://www.telegraph.co.uk/news/2024/01/11/t-rex-had-secret-cousin-with-blunt-teeth-scientists-say/#:~:text=The%20animal%20has%20been%20dubbed,around%20seven%20million%20years%20earlier.

T-Rex had secret cousin with blunter teeth, scientists findThe Telegraph

"This is approximately 5–7 million years before T. rex, which existed at the end of the Maastrichtian. T. mcraeensis was estimated at 12 metres (39 ft) long, which is similar to the size of an adult T. rex. The two are distinguished by characters of the skull."

-Wikipedia-

"The animal has been dubbed Tyrannosaurus mcraensis and grew to the same size as a T-Rex, about 12-metres (40ft) and weighing ten tons, and was roughly the same in proportions. However, the sister species is thought to have existed before the T-Rex and lived around seven million years earlier."

-The Telegraph-

From the studies I could find, T.Mcraensis had similar proportions to T.Rex, and generally grew to a similar size, with The One Described Specimen estimated to be around 11 - 12 Meters (Or 36 - 40 Ft) and 7 - 8+ Tons (Or 14,000 - 16,000+ Lbs), with Larger Specimens yet to be found estimated to be similar in size with some of the larger T.Rex specimens like Scotty.