There are no plans to use them on services to Oxford.
But they were originally announced as being for the Reading-Oxford services as well - have a look at the first posts in this thread. If I have understood the position from following this over the last three years this has changed and Reading - Basingstoke is now the other route they will cover.
Which inspires an idea, partly stimulated by Marlburian's recent post -
Time was when I would take the train to a nearby town or village and walk, before returning home by rail. But the current hourly service to and from Tilehurst doesn't encourage this, compared with the previous half-hourly one.
As for travelling east through Reading, it seems eons ago since in January 2020 I was lamenting having to hang around on the station for a connecting service at certain times of the day.
I didn't bother to renew my Senior Railcard that expired two weeks ago.
We currently have two "gaps" without
OHL▸ on services around Reading - Didcot to Oxford, and Reading to Basingstoke. The former is now a fractured service with changes/delays at Didcot. For some reason the stopping Reading to Didcots have still not been restored to half-hourly. As Marlburian says, this is quite a disincentive to using the train to get into Reading or take a connecting train onwards, with the prospect of possibly nearly an hour's wait (or two if there's a cancellation). Furthermore, there is the somewhat frustrating sight of lightly loaded 8 coach trains running hourly when 5 years ago it was a much more convenient half hourly off peak service run comfortably with 2 or 3 car trains.
I appreciate that compared to the travails of Melksham passengers (once again highlighted by today's posts) this seems like a "first world problem", but every reduction in service frequency is another group of people who will think "why bother with the train, I might as well drive".
So - if there's some reason why the pre-covid half hourly off peak stopping services continuing on to London cannot be restored, why not combine the Reading - Oxford stopping services and the Reading-Basingstoke one into an hourly Oxford-Basingstoke, reversing at Reading, one that can use 769s switching power at Reading and Didcot, thereby restoring a half-hourly stopping service from Reading to Didcot, and also possibly releasing a few more Turbos for the west?