All EU, EEA and Swiss citizens and their family members who were resident in the UK by 31 December 2020, should apply without delay so that they can continue to work, study, and access free healthcare and benefits in the UK after 30 June 2021. 

UK Employers should remind them of the approaching deadline and cascade the information in the employer toolkit available on GOV.UK. 
From 1 July, new EU, EEA and Swiss employees who are hired will need to demonstrate their right to work either with the pre-settled or settled status, or with a visa under the points-based immigration system