Normally, I'd say something like
'I'll be at home around/about 10 or so'
'I'll be at home around/about 10 or earlier'
'I'll be at home around/about 10-ish'
These would be said to someone who is asking you if you will be at home at a certain time. If you were leaving the house and telling someone when you will be back, leave out the preposition 'at' before 'home' i.e.
'I'll be home about 10-ish'