Orlaya Grandiflora

I have planted these this year for the first time and absolutely love them. Have read you can store the seed after it has gone brown to sow later and also it will flowers more if you deadhead. My problem is not knowing which ones have flowered and waiting to turn brown or which have still to flower. Can anyone advise as don’t want to cut flowers if there are no more to come. I only have four at the minute as was a bit of a trial but just want more hence wanting to keep seed. Thanks and maybe photos if you have of both may help.