The original intention was that work would begin in the summer of 2020 with the new sports facility completed in time for the academic year 2021/22. However COVID delayed the planning permission and tendering processes. The current thinking is that Phase 1 will begin in 2021. The original plan had been for Phase 2 to take place from 2022-2025 but there is no indication yet that this plan can be relied on because of the potential impact of COVID on finances.
More images for the Phase 2 process can be seen here.