Maybe s/he wants to say "我马上就到了" or "我马上就好了" or "我马上就来了". However, s/he missed a word.

This sentence is not complete.There should have a verb with “就”.It just like that i will do something soon.But you don’t know what’s thing i will do.

现 在 我 马 上 就 ....... 了 Replace ...... with any verbs like "來"(coming) or "好" (being ready) or "走" (leaving) And normally, we don't use "现 在" in this sentence. We would say "我 马 上 就 來 了"

现在：Now 我：I 马上：immediately 就了：not an independent word, you can use with another word。It is a structure use with verb。 .eg: 就出发了 出发： take off 就出发了also mean take off 现 在 我 马 上 就 出发了 Now I take off immediately！

现在 我 马上 就 (到) 了 = right now I'll arrive ./ come