As above you can apply now, however bear in mind it takes about 6 weeks to process your information and any evidence you send them etc. This might delay you being confirmed for SFE and receiving it - I would recommend you advise the OU of this beforehand so they can make a note that your funding may come in slightly late (this isn't super uncommon). If it ends being very delayed you may need to pay the tuition fees yourself (however when I had to do this with the OU, they reimbursed me for the amount I paid once my SFE funding was confirmed and paid out to them).