I'm non EU married a to a British citizen( (passed my life in the uk test today

SMP (STOPPED ON THE 39 WEEK)
Working Tax Credit (STOPPED ON THE 39 WEEK)
Child Tax Credit and Child benefit
Housing Benefit (based on 3 people)
Council Tax Support
she's due back to work on the 1st of APRIL
my entry clearance expires on 15/03 and my 2 years will complete on 10/03 so should i wait or can i submit the Application now
would any of the above benefits has an impact on my SET(M) application and is't better to apply by Post or go to PEO (is this considered straightforward application )
Thanks in advance

