It can give a good fall starting tomorrow. However if the base of triangle is not broken then the stock will move into sideways trends for some time. Inn that case it may not be good bet for the expiry.
Monday's trade for sept expiry: Sell below 248. SL 252. Overall (not limited to expiry) Tgt 227
Buy above 255. SL 251. Tgt 262
Loss -> 248 - 243 = 5
If you traded in 1 lot your loss is -> 5 * 3000 = 15000