One of the first things I do when searching for either covered calls to do or just general premium selling plays is to look for high implied volatility underlyings with relatively decent expirations, strike widths, and fairly tight spreads (i.e., having weeklies is best with $1 wide strike widths and a bid/ask that is no more than .15 wide from top to bottom is ideal, although I'll bend those rules from time to time; TWLO's a good example of this, nasty wide spreads, but premium too juicy to pass up).
After I identify those, I start looking at actual plays to see if I can make something out of them, looking at all possible premium selling strategies -- short nakeds, short straddles/strangles, credit spreads, iron condors, etc.
Here's today's lists of stocks, sector exchange-traded funds, and broad-market exchange traded funds, ranked by their implied volatility percentage: Stocks
RIGL 219 (biotech) (in a trade), NVAX (biotech) 185 (in a trade), GSAT (telecomm) 152, TDW (O&G) 117, SDRL (O&G) 93, MX (semicon) 78, CHK (O&G) 78 (in a trade), GLNG (solar) 76, CLF (mining) 75 (in a trade), WLL (O&G) 73 (in a trade), CDE (mining) 72, HL (gold/mining) 70 (in a trade), GNW (financial) 69, LC (financial) 65, VRX (biotech) 62, AUY (gold/mining) 60, AMD (semicon) 60, NE (O&G) 60 (in a trade).
Sector Exchange-Traded Funds
GDX (gold miners) 42, XME (mining) 38 (in a trade), XBI (biotech) 36, XOP (O&G) (33).
Notes: The RIGL play posted here is the play I'm in. It's not currently workable except possibly as a naked 2.5 short put play due to strike width -- 2.5, 5.0, etc.
@TransitMan, Unfortunately, there isn't a feed/indicator for implied volatility on TV. HV (Historical Volatility) can give you a notion of where IV is at if you set it at a lower time frame (for example, 3-5 days). There are a number of web sites that publish expiry/strike-specific implied volatility -- barcharts.com is one. There may be others.