It used to be commonplace a hundred years ago, when children used to learn via phonics, for well-to-do children to be reading fluently at around 3 or 4.
It’s fine to be teaching the sounds, but just make sure you’re using ‘pure’ sounds (ways of saying the sounds that facilitate later blending)
Here’s a tutorial :
Really important that you use pure sounds otherwise your child will have to re-learn when she’s at school.
You can also set her up for blending success by doing some oral blending activities
These activities take a few minutes (don’t know where people get these ideas that children learning phonics = hours and hours of seated lectures) and you do not need to be a qualified teacher.
To support your child even more, read a story/fact book to her every day because this will increase her vocabulary and knowledge of the world.
She’ll be assessed when she starts reception, so likely to go into the top reading set if she already knows the m,a,s,t,p sound-letter correspondences.