Advice needed for UC migration timing

Hi, I received my migration letter last week so I still have plenty of time. Having said that I turn 60 (20th March) and will receive a small occupational pension from a very old job that I must take at 60. A lump sum (paid on 21st March) and a monthly payment roughly 85 pounds a month at the end of each month in arrears. The pension payment at the end of March will be pro rata as it will only be from 20th March i.e not a full month. The lump sum will be a few thousand that will take me to less than 7500 in total across accounts on 21st March. Do I tell DWP whilst still on ESA risking delays then having to do it on uc as well or just do it all at my migration uc claim. If the latter do I wait until end of March or April (when I get a full month and a statement to show). I want to make it easier on myself for the migration without confusing DWP ending in any issues that could be avoided. Any advice pro and con appreceiated. Im in ESA support group.

Thank you for the reply. If I make a claim before the change of circumstance that will happen on the 21st March, can I report it in the journal on that day and is that the same as telling DWP and it will be job done?

Thanks again. I have been gathering what I needed for the migration form over the past week and decided to do it today. I have hit an issue in the 'Income other than earnings' section at the confirmation stage at the end. I said 'yes' to claiming or receiving the following etc as esa is in the list, but at the confirming stage it is saying I am not receiving 'Income other than earnings despite me saying yes. I went to edit the section and it still had my correct answer of 'yes' but it is not changing. Is this normal because I cannot submit it with this as it is incorrect. In the health section I did say yes to getting esa as a health benefit and that is showing correctly.