Sounds like he is doing fine! You want him to be on 4 bottle feeds a day at this age and babies don't take exactly the same amount at each feed so keep offering 8oz bottles and let him take what he wants, he needs to be taking at least 24oz really, anything more is a bonus.
Mush is not necessary at all, people who follow baby led weaning do no much as all and their babies do just as well as mush fed babies
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When my two were 8 months their routine was like this (but not sure on timings now!). I did puree for a short while and gave finger foods from 6 months so we moved to mashed rather than puree very quickly.
Wake up and bottle
1 hour later solids - this was cereal, sometimes toast fingers
Nap
Bottle
Solids lunch - a "meal" so carb/ veg/ protein based with fruit and/ or yoghurt
Nap
Bottle
Evening meal solids - again carb/ protein/veg and fruit/ yoghurt
Bed time routine, bottle, sleep
I only gave cereal at breakfast time as I wanted them to have similar meals to us and we only eat cereal in the mornings! Don't forget that milk in foods counts towards their daily intake but milk needs to be the main part of their diet until they are 1.
HTH!
Laura