I just did that today. I was able to complete 856 hours on Tuesday. I have sent them completed hours today.You can only qualify if you meet the 120 hours with March 14 and August 14 as well as completing a six months or 750 hours experience. The 750 hours minimum is inclusive of the 120 hours. If you submitted on the 120 hours, your application would be acknowledged but decision will not be made until you submit the full work experience. according to their website, you have until August 2021 to complete the 6 months or 750 hours and until October 2021 to submit all supporting documents (most importantly your payslips and reference letter that you completed the requirements). If you have so far completed the 750 hours, then you should send this to them quoting your application number. Best of luck.
Hopefully there will update anytime soon