The $146 is an approximate value in $US. It could drop or rise a bit before the 7 days is done and the payout is made.

You will only get about 75% of the $ amount shown, as the other 25% goes to curators (the people who voted for you.)

You can check your wallet 7 days after the post and 'claim' your rewards.
I don't know if you chose to "power up" or to do the 50/50.
Power up will put all the steem into your locked-in wallet, which you can't easily remove (there is a way but you can learn that later.)
And 50/50 will pay half in powered-up Steem and half in Steem Dollars, which are free to withdraw right aways if you want to.

Steem is a crypto-currency like Bitcoin.
It's a big learning curve to withdraw as cash. You would have to open up a Bitcoin wallet, etc.

But if you don't really need money right now, you are best to power up your steem, as that increases your influence on the Steem network, and makes your vote for others worth more.