Assuming you have a validator running, or have tokens staked to a validator, you'll eventually want to withdraw your rewards. Here's how to do it.
First find your validator address:
$ mtcli keys show validator --bech val -a
cosmosvaloper15hs9l7mzjfe9s507l0sjg7d4ulmst2l2lcrtx4
To query your outstanding rewards:
$ mtcli query distr rewards <delegator address=""> [validator address]</delegator>
To withdraw rewards from a particular validator:
$ mtcli tx distr withdraw-rewards <validator address=""></validator>
To withdraw all rewards for a single delegator address:
$ mtcli tx distr withdraw-all-rewards --from <delegator address=""></delegator>
