It should ticket in 2-3 days, keep checking CMT for a ticket number. BMI is rarely in a hurry with these things!
Your ticket will not 'arrive'. In theory, you should have had an e-mailed e-ticket receipt from BMI within seconds of putting down the phone to the call centre. In practice, you only get them 50% of the time. You don't really need it anyway - just print off the checkmytrip details.