The site ı send says that you should work at least 1 year(12 months) before apply
its written at the below
This is the line I found pertaining to that from the link you shared:
“You must have had income during the 12 months (1 year) prior to your application and demonstrate that you will continue to have this income for the duration of your undertaking.”
It doesn’t mean the sponsor should have worked for the whole year. But it does say that they must have had income in the 12 months leading up to the submission of the application that proves they can support the applicant.
As an example, if the sponsor is being paid 50,000 annually and they started working six months prior to the submission but can show that the employment is indefinite or it’s a long-term contract then it’s enough