Have you started solids at all? Not pushing, just asking... it would fit something like this:
6 - awake, milk
7 - solids with water/milk
9 - nap
10:30/11 - wake, milk
12 - solids with water/milk
1:30/2 - nap
3/4 - wake, milk
6:30 - milk
7 pm - in bed asleep for the night.
or you could do this (if your LO will let you wait - mine wouldn't!):
6 - awake
7 - milk
9 - nap
10:30/11 - wake
11:30 - milk
1:30/2 - nap
3/4 - wake, milk
6:30 - milk
7 pm - in bed asleep for the night
Yes, I think pushing his A times during the day will help with the nights.
I worry he won't lengthen daytime naps to that extent and he will have too much A time prior to E and b ready for S straight after E he sometimes will only sleep 40 minutes at his lunchtime sleep.
Pretty normal worry - he may not lengthen them initially, in which case, you just shorten the next A time a little and your E's get a little closer together for a few days. Its not a schedule - its a routine so LO knows what's coming next. Sleeping only 40mins is typically from being undertired when he went down for the nap, so if you push the A time, the nap should extend (though if he wakes at 30min, jump in and resettle asap to give him a few days to get used to the new A time).