I think since your law degree is not from England and Wales, you are considered a non-law student, so you might still need to do the PGDL prior to the SQE, if the firm requires it (for example, I know Slaughter & May requires non-UK law degree students to do this). Therefore, you'll have to check each individual law firm - for those that only accept applications for final-year non-law students, you'll have to wait until 2 years from now to apply, but if they accept from penultimate-year non-law students, then you can apply next year. But your best bet is to email firms' graduate recruitment to find out when you're eligible.