sweetie, I think your question is as much about how much homework your dd has in Reception as it is about the way in which reading is taught.
I do feel Reception seems rather early to be teaching children to read. But I have moved on from that - if the school wants to start, then I should support it so as not to give my dd mixed messages. The alternative is to change schools, which is not necessary because dd is otherwise happy. Until she flounders and starts showing signs of losing confidence, there is no need to jump the gun.
But what I do object is putting the emphasis on children learning to recognise whole words, frequently looking at pictures and context and guessing as well, BEFORE having a sound foundation in phonics.
My dd in Reception has a series of word cards she has to learn, some of which can be sounded out in simple phonics, others like 'here', 'me', 'we' and 'like' cannot. And she has not even been taught all the letter sounds of the alphabet reliably yet!
'Tis confusing, even for me to teach her.
To remedy this, I have bought some Jolly Phonics to give her a good grounding in phonics, so that she does not pick up bad habits like guessing. That is even more homework for me!
I would find out which reading scheme your school uses. My preference is for pure synthetic phonics like Jolly Phonics at early stages, rather than Oxford Reading Tree or Ginn.
Read here about how the mixed method of teaching reading in UK is not potentially flawed