The Government has published advice and information about the support available to migrants with Leave to Remain during the coronavirus pandemic: https://www.gov.uk/guidance/coronavirus-covid-19-get-support-if-youre-a-migrant-living-in-the-uk.
Most migrants with Leave to Remain in the UK are subject to no recourse to public funds (NRPF). Successive governments have set the threshold for migrants qualifying for public funds at Indefinite Leave to Remain, reflecting the strength of connection to the UK of those who hold this status. However, many of the measures introduced to support people through the coronavirus pandemic, including the Coronavirus Job Retention Scheme and protections for renters, are available to those with NRPF.
Individuals whose basis of stay in the UK is based on their family life or human rights can apply to have the NRPF condition lifted by making a ‘change of conditions’ application if there are exceptional circumstances in their case relating to financial circumstances.