Pruning this shrub (escallonia?)

Hello,
I recently bought a house and the driveway came with 3 big shrubs (son for scale) . I think they are escallonias.
The inside is pretty much bare and the back is not carrying a lot of leaves (some tiny leaves sprouting inside) Can I just take the hedge trimmer and trim it half the size? And when is the right time? Just after flowering?
Thank you
I recently bought a house and the driveway came with 3 big shrubs (son for scale) . I think they are escallonias.

Thank you
0
Posts
Normally you would prune escallonia in the autumn around September after they've finished flowering. You can cut them hard back with a hedge trimmer, l found an old thread here which may be of some help.
https://forum.gardenersworld.com/discussion/32324/when-to-prune-escallonia
It's only the 1st of May. I'd cut it back hard now and give it a good feed.