I can agree that Jesus appeared to his "apostles" in Matt 16, and he told them these signs shall follow them that believe, but I do not see where he said these signs will only follow the apostles themselves. We also see in another scripture, Jesus saying the same thing about who soever shall believe in Jesus will the same works as Jesus.
Joh 14:12 "Truly, truly, I say to you, whoever believes in me will also do the works that I do; and greater works than these will he do, because I am going to the Father.
All the way back to Moses in Ex. 4:1.......
"And Moses answered and said, But, behold, they will not believe me, nor hearken unto my voice: for they will say, The LORD hath not appeared unto thee. "
Moses wanted to know why the Israelites would listen to the message of deliverance God had given him. God responded by giving his three signs to convince the Jews that the word Moses spoke was really from God.
Ex. 4:1-9.....
[1] "And Moses answered and said, But, behold, they will not believe me, nor hearken unto my voice: for they will say, The LORD hath not appeared unto thee. [2] And the LORD said unto him, What is that in thine hand? And he said, A rod. [3] And he said, Cast it on the ground. And he cast it on the ground, and it became a serpent; and Moses fled from before it. [4] And the LORD said unto Moses, Put forth thine hand, and take it by the tail. And he put forth his hand, and caught it, and it became a rod in his hand: [5] That they may believe that the LORD God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath appeared unto thee. [6] And the LORD said furthermore unto him, Put now thine hand into thy bosom. And he put his hand into his bosom: and when he took it out, behold, his hand was leprous as snow. [7] And he said, Put thine hand into thy bosom again. And he put his hand into his bosom again; and plucked it out of his bosom, and, behold, it was turned again as his other flesh. [8] And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign. [9] And it shall come to pass, if they will not believe also these two signs, neither hearken unto thy voice, that thou shalt take of the water of the river, and pour it upon the dry land: and the water which thou takest out of the river shall become blood upon the dry land."
These verses are the first use of miraculous signs in the Bible and this passage shows us their original intent.
Signs were used to authenticate the spoken word. They verified that the message spoken by a man was indeed from God.
Matthew 24:24 ...........
"For false Christ's and false prophets will arise and
will show great signs and wonders, so as to mislead, if possible, even the elect".
Is it legitimate, then, to say that God does not work miracles today as you already asked?
We must be careful to distinguish between a divinely-wrought miracle and a sign gift. Our sovereign, omnipotent God is fully able to perform a miracle any time, anywhere, and any way He pleases. But not all miracles are meant as signs, and a miracle is not necessarily the result of a charismatic gift from a specific person.
By way of contrast, a one-time miracle does not constitute a sign gift—especially if there was no human agent involved. It is appropriate to pray to God for help when we are sick, impoverished, or threatened by our adversaries, and to have the confidence that He is fully able to provide that help as is told to us in James 5.
Have you observed that most often, God comes to our aid through the ordinary course of providence through GRACE in ways that are not really miraculous. God is often pleased to provide healing to one diagnosed with an incurable disease, or to provide unexpected victory to an army that is hopelessly outnumbered.
So to answer your question, "Miracles, then, do occur in our day", but not as the result of individuals having a special gifting to work miracles. When miracles occur, IMHO, they are intended as expressions of divine mercy and God's grace to those in distress, and are not intended as extravagant displays of divine power to the unsaved world at large.