Any reason why you want to start your own daemon instead of just using a pool and paying the low 1% fee? I don't know how it is for XMR but with ETH or BTC if you want to mine it needs to be fully synced.
I can't think of anything other than OP is trying to solo mine Monero or opening his own pool.
BTW, Just like Bitcoin and Ethereum, Monero also requires a fully synced node before you can start mining.
Unless he's not informed about mining pools, the only valid reason to mine using a full node is "
solo mining".
@
bitbadger for DYOR purposes, Check the selection of pools
here, there are info and links to their sites too if you need more info.