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You will need to be more patient. If you have been experiencing unusually cool or unusually hot weather, this can slow down the ripening process. They will ripen though, you just have to give them more time.

what are the blue things on the stem of roma tomato plant??

Yes, tomatoes are a warm weather plant. Their growth can slow and even stop in cold weather. They need temps over 50F to grow and grow best when temps are around 70F-80F.

If the leaves are pale colored, rather than yellowing, then it is likely that they were not hardened off correctly and are suffering from sunscald. This would cause pale leaves and stunted growth while the plant recovers from the scald.

It may also be a wilt or a virus, but if it is, the seedlings are a loss. Watch for new growth. If there is new healthy growth, it was sunscald and the will recover. If there is not new healthy growth, remove the plants and replace them.

Typically after the fruit sets, it should be 2-3 weeks to harvest. If it's cooler than usual in your area, then this could make it longer for the fruits to turn. Tomatoes need heat to ripen well and if they don't get that, they may stay green for some time, though too much heat isn't good. Over 85 F. and tomatoes slow down their ripening. Over 95 F. and ripening virtually stops. About the only thing you can do is wait. However, if you have to, you can always pick some and allow them to ripen in a windowsill indoors.

If you are referring to soft, dark spots on the bottom of tomato fruits, then it is blossom rot. It is normally caused by a lack of calcium in the soil or irregular watering. Here is more information: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm