Which part do you think that for?
Here's clause 16 of the agreement
16 Resettlement of vulnerable Refugees
16.1 The Participants will make arrangements for the United Kingdom to resettle a portion of Rwanda’s most vulnerable refugees in the United Kingdom, recognising both Participants’ commitment towards providing better international protection for refugees.
And here's the BBC saying 240 million so far
What is the UK's plan to send asylum seekers to Rwanda?
https://www.bbc.co.uk/news/explainers-61782866