Applying to university late (aka now lol)

I'm a graduate so already have all of my qualifications, and I'm applying for some nursing programmes. I saw that there is a UCAS deadline of 30 June 2023, but that the main deadline was in January.

Is it likely that applying this late will have ruined my chances? Will I still be required to attend interviews or will it be too late for that? I'm not really sure what to expect and don't want to get my hopes up that I'll be able to get a place for this September.

I'm waiting on my reference and then will submit my application ASAP.

Yes, you will have to attend interviews - it's part of the process of applying for nursing degrees.
As long as wherever you're applying to still has spaces, you have a chance. Just be prepared for potentially being offered Feb/March 24 start rather than September 23 with applying at this stage. It's not the end of the world if you don't get a place... it takes many people a few attempts (3 attempts for me, someone with a previous degree and healthcare experience - and I qualified 4 years ago).