You can apply for naturalisation when at least a full year has passed from the date of your ILR approval, as long as you have lived in the UK for at least 5 years (assuming you are not married to a British citizen) As you entered the UK on 9th November 2015 and you need 5 years, you can only apply on or after 9th November 2020.
If you choose to apply on a date, you should have been
present five years ago in the UK on the same date. So for example, if you apply on 20th November 2020, you must have been in the UK on 20th November 2015. There are also other requirements you have to meet: like not having more than 90 days of absence in the last year (as well as less than 450 days in total in the last 5 years), being of good character, etc
See:
https://www.gov.uk/government/publicati ... n-guidance
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