My DS is now 12 and has a diagnosis of autism. I remember the early years being very difficult. My DS didn't say a word until he was almost 4. I remember it used to break me hearing other DC his age talking in the park or at nursery. I couldn't take him to playgroups or play dates as he would just scream and cry.
My DS is now fully verbal - in fact he never stops talking! His use of language is always going to be a bit 'unusual' (eg he will talk 'at' you about his special subject of interest) but things are easier now he can explain why he finds certain things so difficult.
There's no 'magic wand' as I'm sure you know but what him helped I think was: Portage. If you're not aware of this service, google Portage + your local authority. In my Dc's case, a lovely lady came round to play with him once a fortnight and give me tips on trying to help his social communication. They work with pre-schoolers.
Nursery. My Ds went to a SureStart nursery (I'm not sure if they're still around now) from the age of 2. This also helped me with my mental health to be honest to give me a 2-hour break a day which made me a better mum. He had full time support at nursery. The settling in was really hard but after a few months, he wouldn't want to leave at the end of a session. The nursery also supported me in ensuring my DS got support for when he started primary.
Speech and language. He saw a SALT therapist every week - and still does even at secondary school. I didn't realise at the time but a SALT teacher will work not just on encouraging DC to use langauge but also on their social communication skills.
My DS is at a mainstream secondary school now with full time support. He has his ups and downs but when I look back to how he was at aged 2, I never in a million years thought we'd be here. He is quite academically able and is expected to take GCSEs - although probably not as many.
In terms of your DS, the fact that he's pointing is hugely encouraging. I know it's hard not to worry about the future but your DS is still so young. With my DS, he took longer to reach milestones like speaking, reading etc but when he got there, it was all the sweeter.
Some DC never gain language it's true but many do learn to communicate in other ways.
Does your Ds go to nursery? If so, what have they said about schools? You have a while to go before you need to make those decisions.
You're doing all the right things in applying for DLA and an EHCP. If you've not seen it, Ipsea is a great resource for EHCP information:
www.ipsea.org.uk/ehc-needs-assessments
Some areas run courses for parents/carers of newly diagnosed DC. They can be a good way of meeting other people in a similar place/sharing tips.