You won’t be able to do that at least until 2025 which is when the HBO deal expires.
Then the new “Max” or whatever Warner Bros Discovery name it will be in full swing. By the looks of it will be a combination of what HBO Max and Discovery+ offers in terms of content.
The Oscars on Demand is available now on Sky Cinema on Demand.
It should follow on Sky Max on Demand shortly.
This is what happened last year and i just remembered from last year the highlights on Demand was 1 hour and 30 minutes (which equates to 2 hours from the live highlights with all the live adverts cut would be around the 1 hour 30 minutes mark).