Further detail to this
Taking it from a June 2023 start (which started on time) for site start for general improvements works, onwards. October as the site mobilisation for the stand, November for works to the stand.
Weeks 1-33, piling and drainage
Weeks 23-67 main structure including support for the roof, removal of back stays, installation of new concourses and terracing.
Weeks 30-88, temporary support for existing roof, and removal of roof.
Weeks 50-88, erection of new roof and walls of new stand, including cladding and external finishes
Weeks 45-95 fit-out including seating, m&e and safety systems.
95 weeks for the stand, with overlaps plenty. That's isolating just the stand, which in reality will be happening at times simultaneously with the commercial buildings behind.
Hope that helps (if it hasn't changed since)