Premium is quite good, and TZA is near its 52-weeks low, the holding period yield of 18 days is about 4.1%.
Be on the look out as TZA is a triple leveraged inverse small cap ETF, so the underlying can be volatile. Be prudent and ready to stop loss if market continues to trend upward.
If obligated to exercise, start selling covered call at or above your entry price. There is a good chance that your position will be called away if market does trend downward.